Generate tests

test/language/expressions/async-generator/named-yield-star-expr-abrupt.js

@@ -0,0 +1,53 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-expr-abrupt.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Abrupt completion while getting yield* operand (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    ...
+
+---*/
+var obj = {};
+var abrupt = function() {
+  throw obj;
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* abrupt();
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, obj, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-get-abrupt.js

@@ -0,0 +1,73 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-get-abrupt.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Abrupt completion while getting [Symbol.asyncIterator] (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  get [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-not-callable-boolean-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-boolean-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (boolean) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: false
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-not-callable-number-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-number-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (number) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: 0
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-not-callable-object-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-object-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (object) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: {}
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-not-callable-string-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-string-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (string) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: ''
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-not-callable-symbol-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-symbol-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (symbol) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: Symbol.asyncIterator
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-null-sync-get-abrupt.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-null-sync-get-abrupt.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Abrupt completion while getting @@iterator after null @@asyncIterator (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-returns-abrupt.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-abrupt.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Abrupt completion while calling [Symbol.asyncIterator] (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-returns-boolean-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-boolean-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - boolean (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return true;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-returns-null-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-null-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - null (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-returns-number-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-number-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - number (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return 42;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-returns-string-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-string-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - string (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return '42';
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-returns-symbol-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-symbol-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - symbol (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return Symbol.asyncIterator;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-returns-undefined-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-undefined-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - undefined (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-async-undefined-sync-get-abrupt.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-undefined-sync-get-abrupt.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Abrupt completion while getting @@iterator after undefined @@asyncIterator (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-get-abrupt.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-get-abrupt.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Abrupt completion while getting [Symbol.iterator] (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-not-callable-boolean-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-boolean-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (boolean) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: false
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-not-callable-number-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-number-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (number) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: 0
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-not-callable-object-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-object-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (object) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: {}
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-not-callable-string-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-string-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (string) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: ''
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-not-callable-symbol-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-symbol-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (symbol) (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: Symbol.iterator
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-returns-abrupt.js

@@ -0,0 +1,66 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-abrupt.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Abrupt completion while calling [Symbol.iterator] (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  [Symbol.iterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-returns-boolean-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-boolean-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.iterator]() - boolean (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return true;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-returns-null-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-null-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.iterator]() - null (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-returns-number-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-number-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.iterator]() - number (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return 0;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-returns-string-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-string-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.iterator]() - string (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return '';
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-returns-symbol-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-symbol-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.iterator]() - symbol (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return Symbol.iterator;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-star-getiter-sync-returns-undefined-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-undefined-throw.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Non object returned by [Symbol.iterator]() - undefined (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-expr-abrupt.js

@@ -0,0 +1,53 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-expr-abrupt.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Abrupt completion while getting yield* operand (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    ...
+
+---*/
+var obj = {};
+var abrupt = function() {
+  throw obj;
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* abrupt();
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, obj, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-get-abrupt.js

@@ -0,0 +1,73 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-get-abrupt.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Abrupt completion while getting [Symbol.asyncIterator] (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  get [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-not-callable-boolean-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-boolean-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (boolean) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: false
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-not-callable-number-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-number-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (number) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: 0
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-not-callable-object-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-object-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (object) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: {}
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-not-callable-string-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-string-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (string) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: ''
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-not-callable-symbol-throw.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-symbol-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (symbol) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: Symbol.asyncIterator
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-null-sync-get-abrupt.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-null-sync-get-abrupt.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Abrupt completion while getting @@iterator after null @@asyncIterator (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-returns-abrupt.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-abrupt.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Abrupt completion while calling [Symbol.asyncIterator] (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-returns-boolean-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-boolean-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - boolean (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return true;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-returns-null-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-null-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - null (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-returns-number-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-number-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - number (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return 42;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-returns-string-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-string-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - string (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return '42';
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-returns-symbol-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-symbol-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - symbol (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return Symbol.asyncIterator;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-returns-undefined-throw.js

@@ -0,0 +1,69 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-undefined-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - undefined (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-async-undefined-sync-get-abrupt.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-undefined-sync-get-abrupt.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Abrupt completion while getting @@iterator after undefined @@asyncIterator (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-get-abrupt.js

@@ -0,0 +1,72 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-get-abrupt.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Abrupt completion while getting [Symbol.iterator] (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-not-callable-boolean-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-boolean-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (boolean) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: false
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-not-callable-number-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-number-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (number) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: 0
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-not-callable-object-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-object-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (object) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: {}
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-not-callable-string-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-string-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (string) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: ''
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-not-callable-symbol-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-symbol-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (symbol) (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: Symbol.iterator
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-returns-abrupt.js

@@ -0,0 +1,66 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-abrupt.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Abrupt completion while calling [Symbol.iterator] (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  [Symbol.iterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-returns-boolean-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-boolean-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.iterator]() - boolean (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return true;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-returns-null-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-null-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.iterator]() - null (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-returns-number-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-number-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.iterator]() - number (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return 0;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-returns-string-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-string-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.iterator]() - string (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return '';
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-returns-symbol-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-symbol-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.iterator]() - symbol (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return Symbol.iterator;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-star-getiter-sync-returns-undefined-throw.js

@@ -0,0 +1,71 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-undefined-throw.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Non object returned by [Symbol.iterator]() - undefined (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield* obj;
+    throw new Test262Error('abrupt completion closes iter');
+
+};
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-expr-abrupt.js

@@ -0,0 +1,60 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-expr-abrupt.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Abrupt completion while getting yield* operand (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    ...
+
+---*/
+var obj = {};
+var abrupt = function() {
+  throw obj;
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* abrupt();
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, obj, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-get-abrupt.js

@@ -0,0 +1,80 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-get-abrupt.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Abrupt completion while getting [Symbol.asyncIterator] (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  get [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-not-callable-boolean-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-boolean-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (boolean) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: false
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-not-callable-number-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-number-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (number) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: 0
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-not-callable-object-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-object-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (object) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: {}
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-not-callable-string-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-string-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (string) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: ''
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-not-callable-symbol-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-symbol-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (symbol) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: Symbol.asyncIterator
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-null-sync-get-abrupt.js

@@ -0,0 +1,85 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-null-sync-get-abrupt.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Abrupt completion while getting @@iterator after null @@asyncIterator (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-returns-abrupt.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-abrupt.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Abrupt completion while calling [Symbol.asyncIterator] (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-returns-boolean-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-boolean-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - boolean (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return true;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-returns-null-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-null-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - null (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-returns-number-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-number-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - number (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return 42;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-returns-string-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-string-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - string (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return '42';
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-returns-symbol-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-symbol-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - symbol (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return Symbol.asyncIterator;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-returns-undefined-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-undefined-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - undefined (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-async-undefined-sync-get-abrupt.js

@@ -0,0 +1,85 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-undefined-sync-get-abrupt.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Abrupt completion while getting @@iterator after undefined @@asyncIterator (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-get-abrupt.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-get-abrupt.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Abrupt completion while getting [Symbol.iterator] (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-not-callable-boolean-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-boolean-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (boolean) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: false
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-not-callable-number-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-number-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (number) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: 0
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-not-callable-object-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-object-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (object) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: {}
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-not-callable-string-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-string-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (string) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: ''
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-not-callable-symbol-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-not-callable-symbol-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.iterator] (symbol) (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]: Symbol.iterator
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-returns-abrupt.js

@@ -0,0 +1,73 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-abrupt.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Abrupt completion while calling [Symbol.iterator] (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  [Symbol.iterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-returns-boolean-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-boolean-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.iterator]() - boolean (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return true;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-returns-null-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-null-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.iterator]() - null (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-returns-number-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-number-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.iterator]() - number (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return 0;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-returns-string-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-string-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.iterator]() - string (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return '';
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-returns-symbol-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-symbol-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.iterator]() - symbol (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return Symbol.iterator;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-star-getiter-sync-returns-undefined-throw.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-sync-returns-undefined-throw.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Non object returned by [Symbol.iterator]() - undefined (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+        ii. Let syncIterator be ? Call(syncMethod, obj).
+        iii. Return ? CreateAsyncFromSyncIterator(syncIterator).
+    ...
+
+    CreateAsyncFromSyncIterator(syncIterator)
+
+    1. If Type(syncIterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  [Symbol.iterator]() {
+    return undefined;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-expr-abrupt.js

@@ -0,0 +1,60 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-expr-abrupt.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Abrupt completion while getting yield* operand (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    ...
+
+---*/
+var obj = {};
+var abrupt = function() {
+  throw obj;
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* abrupt();
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, obj, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-get-abrupt.js

@@ -0,0 +1,80 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-get-abrupt.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Abrupt completion while getting [Symbol.asyncIterator] (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  get [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-not-callable-boolean-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-boolean-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (boolean) (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: false
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-not-callable-number-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-number-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (number) (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: 0
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-not-callable-object-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-object-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (object) (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: {}
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-not-callable-string-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-string-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (string) (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: ''
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-not-callable-symbol-throw.js

@@ -0,0 +1,79 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-not-callable-symbol-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Throws a TypeError on a non-callable [Symbol.asyncIterator] (symbol) (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    3. If func is either undefined or null, return undefined.
+    4. If IsCallable(func) is false, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]: Symbol.asyncIterator
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-null-sync-get-abrupt.js

@@ -0,0 +1,85 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-null-sync-get-abrupt.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Abrupt completion while getting @@iterator after null @@asyncIterator (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+      b. If method is undefined,
+        i. Let syncMethod be ? GetMethod(obj, @@iterator).
+    ...
+
+    GetMethod ( V, P )
+
+    ...
+    2. Let func be ? GetV(V, P).
+    ...
+
+---*/
+var calls = 0;
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw reason;
+  },
+  get [Symbol.asyncIterator]() {
+    calls += 1;
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, 'reject reason');
+  assert.sameValue(calls, 1);
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-returns-abrupt.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-abrupt.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Abrupt completion while calling [Symbol.asyncIterator] (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    ...
+
+---*/
+var reason = {};
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    throw reason;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v, reason, "reject reason");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-returns-boolean-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-boolean-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - boolean (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return true;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-returns-null-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-null-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - null (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return null;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-returns-number-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-number-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - number (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return 42;
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-star-getiter-async-returns-string-throw.js

@@ -0,0 +1,76 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-star-getiter-async-returns-string-throw.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: Non object returned by [Symbol.asyncIterator]() - string (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [Symbol.asyncIterator, async-iteration]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    YieldExpression: yield * AssignmentExpression
+
+    1. Let exprRef be the result of evaluating AssignmentExpression.
+    2. Let value be ? GetValue(exprRef).
+    3. Let generatorKind be ! GetGeneratorKind().
+    4. Let iterator be ? GetIterator(value, generatorKind).
+    ...
+
+    GetIterator ( obj [ , hint ] )
+
+    ...
+    3. If hint is async,
+      a. Set method to ? GetMethod(obj, @@asyncIterator).
+    ...
+    6. Let iterator be ? Call(method, obj).
+    7. If Type(iterator) is not Object, throw a TypeError exception.
+    ...
+
+---*/
+var obj = {
+  get [Symbol.iterator]() {
+    throw new Test262Error('it should not get Symbol.iterator');
+  },
+  [Symbol.asyncIterator]() {
+    return '42';
+  }
+};
+
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    yield* obj;
+      throw new Test262Error('abrupt completion closes iter');
+
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+iter.next().then(() => {
+  throw new Test262Error('Promise incorrectly fulfilled.');
+}, v => {
+  assert.sameValue(v.constructor, TypeError, "TypeError");
+
+  iter.next().then(({ done, value }) => {
+    assert.sameValue(done, true, 'the iterator is completed');
+    assert.sameValue(value, undefined, 'value is undefined');
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);