Merge pull request #918 from leobalter/async-gen-templates

Add async generator templates

src/async-generators/default/async-class-decl-method.template

@@ -0,0 +1,35 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/statements/class/async-gen-method-
+name: Async Generator method as a ClassDeclaration element
+esid: prod-AsyncGeneratorMethod
+info: |
+  ClassElement :
+    MethodDefinition
+
+  MethodDefinition :
+    AsyncGeneratorMethod
+
+  Async Generator Function Definitions
+
+  AsyncGeneratorMethod :
+    async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+class C { async *gen() {
+    callCount += 1;
+    /*{ body }*/
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/default/async-class-decl-static-method.template

@@ -0,0 +1,35 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/statements/class/async-gen-method-static-
+name: Static async generator method as a ClassDeclaration element
+esid: prod-AsyncGeneratorMethod
+info: |
+  ClassElement :
+    static MethodDefinition
+
+  MethodDefinition :
+    AsyncGeneratorMethod
+
+  Async Generator Function Definitions
+
+  AsyncGeneratorMethod :
+    async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+class C { static async *gen() {
+    callCount += 1;
+    /*{ body }*/
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/default/async-class-expr-method.template

@@ -0,0 +1,35 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/expressions/class/async-gen-method-
+name: Async generator method as a ClassExpression element
+esid: prod-AsyncGeneratorMethod
+info: |
+  ClassElement :
+    MethodDefinition
+
+  MethodDefinition :
+    AsyncGeneratorMethod
+
+  Async Generator Function Definitions
+
+  AsyncGeneratorMethod :
+    async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    /*{ body }*/
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/default/async-class-expr-static-method.template

@@ -0,0 +1,35 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/expressions/class/async-gen-method-static-
+name: Static async generator method as a ClassExpression element
+esid: prod-AsyncGeneratorMethod
+info: |
+  ClassElement :
+    static MethodDefinition
+
+  MethodDefinition :
+    AsyncGeneratorMethod
+
+  Async Generator Function Definitions
+
+  AsyncGeneratorMethod :
+    async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    /*{ body }*/
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/default/async-declaration.template

@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/statements/async-generator/
+name: Async generator Function declaration
+esid: prod-AsyncGeneratorDeclaration
+info: |
+  Async Generator Function Definitions
+
+  AsyncGeneratorDeclaration:
+    async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+      AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+async function *gen() {
+  callCount += 1;
+  /*{ body }*/
+}
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/default/async-expression-named.template

@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/expressions/async-generator/named-
+name: Named async generator expression
+esid: prod-AsyncGeneratorExpression
+info: |
+  Async Generator Function Definitions
+
+  AsyncGeneratorExpression :
+    async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+      AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  /*{ body }*/
+};
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/default/async-expression.template

@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/expressions/async-generator/
+name: Unnamed async generator expression
+esid: prod-AsyncGeneratorExpression
+info: |
+  Async Generator Function Definitions
+
+  AsyncGeneratorExpression :
+    async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+      AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  /*{ body }*/
+};
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/default/async-obj-method.template

@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/expressions/object/method-definition/async-gen-
+name: Async generator method
+esid: prod-AsyncGeneratorMethod
+info: |
+  Async Generator Function Definitions
+
+  AsyncGeneratorMethod :
+    async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+var gen = {
+  async *method() {
+    callCount += 1;
+    /*{ body }*/
+  }
+}.method;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/non-strict/async-declaration.template

@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/statements/async-generator/
+name: Async generator function declaration - valid for non-strict only cases
+esid: prod-AsyncGeneratorDeclaration
+info: |
+  Async Generator Function Definitions
+
+  AsyncGeneratorDeclaration:
+    async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+      AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+async function *gen() {
+  callCount += 1;
+  /*{ body }*/
+}
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/non-strict/async-expression-named.template

@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/expressions/async-generator/named-
+name: Async generator named expression - valid for non-strict only cases
+esid: prod-AsyncGeneratorExpression
+info: |
+  Async Generator Function Definitions
+
+  AsyncGeneratorExpression :
+    async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+      AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  /*{ body }*/
+};
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/non-strict/async-expression.template

@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/expressions/async-generator/
+name: Async generator expression - valid for non-strict only cases
+esid: prod-AsyncGeneratorExpression
+info: |
+  Async Generator Function Definitions
+
+  AsyncGeneratorExpression :
+    async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+      AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  /*{ body }*/
+};
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/non-strict/async-obj-method.template

@@ -0,0 +1,29 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/expressions/object/method-definition/async-gen-
+name: Generator method - valid for non-strict only cases
+esid: prod-AsyncGeneratorMethod
+info: |
+  Async Generator Function Definitions
+
+  AsyncGeneratorMethod :
+    async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+features: [async-iteration]
+---*/
+
+var callCount = 0;
+
+var gen = {
+  async *method() {
+    callCount += 1;
+    /*{ body }*/
+  }
+}.method;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/async-generators/yield-identifier-non-strict.case

@@ -0,0 +1,30 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+  Use of yield as a valid identifier in a function body inside a generator body
+  in non strict mode
+template: non-strict
+flags: [noStrict, async]
+---*/
+
+//- body
+  return (function(arg) {
+    var yield = arg + 1;
+    return yield;
+  }(yield))
+//- assertions
+var item = iter.next();
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, false);
+  assert.sameValue(value, undefined);
+});
+
+item = iter.next(42);
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, true);
+  assert.sameValue(value, 43);
+}).then($DONE, $DONE);

src/async-generators/yield-identifier-spread-non-strict.case

@@ -0,0 +1,49 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+  Mixed use of object spread and yield as a valid identifier in a function body
+  inside a generator body in non strict mode
+template: non-strict
+info: |
+  Spread Properties
+
+  PropertyDefinition[Yield]:
+    (...)
+    ...AssignmentExpression[In, ?Yield]
+features: [object-spread]
+flags: [noStrict, async]
+---*/
+
+//- setup
+var s = Symbol('s');
+//- body
+  yield {
+     ...yield yield,
+     ...(function(arg) {
+        var yield = arg;
+        return {...yield};
+     }(yield)),
+     ...yield,
+  }
+//- assertions
+var iter = gen();
+
+iter.next();
+iter.next();
+iter.next({ x: 10, a: 0, b: 0, [s]: 1 });
+iter.next({ y: 20, a: 1, b: 1, [s]: 42 });
+var item = iter.next({ z: 30, b: 2 });
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, false);
+  assert.sameValue(value.x, 10);
+  assert.sameValue(value.y, 20);
+  assert.sameValue(value.z, 30);
+  assert.sameValue(value.a, 1);
+  assert.sameValue(value.b, 2);
+  assert.sameValue(value[s], 42);
+  assert.sameValue(Object.keys(value).length, 5);
+  assert(Object.hasOwnProperty.call(value, s));
+}).then($DONE, $DONE);

src/async-generators/yield-identifier-spread-strict.case

@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+  It's an early error if the AssignmentExpression is a function body with yield
+  as an identifier in strict mode.
+template: default
+info: |
+  Spread Properties
+
+  PropertyDefinition[Yield]:
+    (...)
+    ...AssignmentExpression[In, ?Yield]
+features: [object-spread]
+flags: [onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- body
+  return {
+     ...(function() {
+        var yield;
+        throw new Test262Error();
+     }()),
+  }

src/async-generators/yield-identifier-strict.case

@@ -0,0 +1,19 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+  It's an early error if the generator body has another function body with
+  yield as an identifier in strict mode.
+template: default
+flags: [onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- body
+  (function() {
+    var yield;
+    throw new Test262Error();
+  }())

src/async-generators/yield-spread-arr-multiple.case

@@ -0,0 +1,33 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: Use yield value in a array spread position
+template: default
+info: |
+  Array Initializer
+
+  SpreadElement[Yield, Await]:
+    ...AssignmentExpression[+In, ?Yield, ?Await]
+includes:
+  - compareArray.js
+flags: [async]
+---*/
+
+//- setup
+var arr = ['a', 'b', 'c'];
+var item;
+//- body
+  yield [...yield yield];
+//- assertions
+iter.next(false);
+item = iter.next(['a', 'b', 'c']);
+
+item.then(({ done, value }) => {
+  item = iter.next(value);
+
+  item.then(({ done, value }) => {
+    assert(compareArray(value, arr));
+    assert.sameValue(done, false);
+  }).then($DONE, $DONE);
+}).catch($DONE);

src/async-generators/yield-spread-arr-single.case

@@ -0,0 +1,31 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: Use yield value in a array spread position
+template: default
+info: |
+  Array Initializer
+
+  SpreadElement[Yield, Await]:
+    ...AssignmentExpression[+In, ?Yield, ?Await]
+flags: [async]
+---*/
+
+//- setup
+var arr = ['a', 'b', 'c'];
+//- body
+  yield [...yield];
+//- assertions
+iter.next(false);
+var item = iter.next(arr);
+
+item.then(({ done, value }) => {
+  assert.notSameValue(value, arr, 'value is a new array');
+  assert(Array.isArray(value), 'value is an Array exotic object');
+  assert.sameValue(value.length, 3)
+  assert.sameValue(value[0], 'a');
+  assert.sameValue(value[1], 'b');
+  assert.sameValue(value[2], 'c');
+  assert.sameValue(done, false);
+}).then($DONE, $DONE);

src/async-generators/yield-spread-obj.case

@@ -0,0 +1,36 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: Use yield value in a object spread position
+template: default
+info: |
+  Spread Properties
+
+  PropertyDefinition[Yield]:
+    (...)
+    ...AssignmentExpression[In, ?Yield]
+features: [object-spread]
+includes:
+  - compareArray.js
+flags: [async]
+---*/
+
+//- body
+  yield {
+    ...yield,
+    y: 1,
+    ...yield yield,
+  };
+//- assertions
+iter.next();
+iter.next({ x: 42 });
+iter.next({ x: 'lol' });
+var item = iter.next({ y: 39 });
+
+item.then(({ done, value }) => {
+  assert.sameValue(value.x, 42);
+  assert.sameValue(value.y, 39);
+  assert.sameValue(Object.keys(value).length, 2);
+  assert.sameValue(done, false);
+}).then($DONE, $DONE);

src/generators/default/class-decl-method.template

@@ -0,0 +1,33 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/class/gen-method-
+name: Geenerator method as a ClassDeclaration element
+esid: prod-GeneratorMethod
+info: |
+  ClassElement :
+    MethodDefinition
+
+  MethodDefinition :
+    GeneratorMethod
+
+  14.4 Generator Function Definitions
+
+  GeneratorMethod :
+    * PropertyName ( UniqueFormalParameters ) { GeneratorBody }
+---*/
+
+var callCount = 0;
+
+class C { *gen() {
+    callCount += 1;
+    /*{ body }*/
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/generators/default/class-decl-static-method.template

@@ -0,0 +1,33 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/class/gen-method-static-
+name: Static generator method as a ClassDeclaration element
+esid: prod-GeneratorMethod
+info: |
+  ClassElement :
+    static MethodDefinition
+
+  MethodDefinition :
+    GeneratorMethod
+
+  14.4 Generator Function Definitions
+
+  GeneratorMethod :
+    * PropertyName ( UniqueFormalParameters ) { GeneratorBody }
+---*/
+
+var callCount = 0;
+
+class C {static *gen() {
+    callCount += 1;
+    /*{ body }*/
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/generators/default/class-expr-method.template

@@ -2,24 +2,24 @@
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 path: language/expressions/class/gen-method-
-name: Generator method as a ClassElement
+name: Generator method as a ClassExpression element
 esid: prod-GeneratorMethod
 info: |
-  ClassElement[Yield, Await]:
+  ClassElement :
-    MethodDefinition[?Yield, ?Await]
+    MethodDefinition
 
-  MethodDefinition[Yield, Await]:
+  MethodDefinition :
-    GeneratorMethod[?Yield, ?Await]
+    GeneratorMethod
 
   14.4 Generator Function Definitions
 
-  GeneratorMethod[Yield, Await]:
+  GeneratorMethod :
-    * PropertyName[?Yield, ?Await] ( UniqueFormalParameters[+Yield, ~Await] ) { GeneratorBody }
+    * PropertyName ( UniqueFormalParameters ) { GeneratorBody }
 ---*/
 
 var callCount = 0;
 
-class C { *gen() {
+var C = class {*gen() {
     callCount += 1;
     /*{ body }*/
 }}

src/generators/default/class-expr-static-method.template

@@ -0,0 +1,33 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/expressions/class/gen-method-static-
+name: Static generator method as a ClassExpression element
+esid: prod-GeneratorMethod
+info: |
+  ClassElement :
+    static MethodDefinition
+
+  MethodDefinition :
+    GeneratorMethod
+
+  14.4 Generator Function Definitions
+
+  GeneratorMethod :
+    * PropertyName ( UniqueFormalParameters ) { GeneratorBody }
+---*/
+
+var callCount = 0;
+
+var C = class { static *gen() {
+    callCount += 1;
+    /*{ body }*/
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/generators/default/declaration.template

@@ -2,13 +2,13 @@
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 path: language/statements/generators/
-name: Generator function declaration
+name: Generator Function declaration
 esid: prod-GeneratorDeclaration
 info: |
   14.4 Generator Function Definitions
 
-  GeneratorDeclaration[Yield, Await, Default]:
+  GeneratorDeclaration :
-    function * BindingIdentifier[?Yield, ?Await] ( FormalParameters[+Yield, ~Await] ) { GeneratorBody }
+    function * BindingIdentifier ( FormalParameters ) { GeneratorBody }
 ---*/
 
 var callCount = 0;

src/generators/default/expression-named.template

@@ -0,0 +1,25 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/expressions/generators/named-
+name: Named generator expression
+esid: prod-GeneratorExpression
+info: |
+  14.4 Generator Function Definitions
+
+  GeneratorExpression:
+    function * BindingIdentifier opt ( FormalParameters ) { GeneratorBody }
+---*/
+
+var callCount = 0;
+
+var gen = function *g() {
+  callCount += 1;
+  /*{ body }*/
+};
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/generators/default/expression.template

@@ -2,13 +2,13 @@
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 path: language/expressions/generators/
-name: Generator expression
+name: Unnamed generator expression
 esid: prod-GeneratorExpression
 info: |
   14.4 Generator Function Definitions
 
   GeneratorExpression:
-    function * BindingIdentifier[+Yield, ~Await]opt ( FormalParameters[+Yield, ~Await] ) { GeneratorBody }
+    function * BindingIdentifier opt ( FormalParameters ) { GeneratorBody }
 ---*/
 
 var callCount = 0;

src/generators/default/obj-method.template

@@ -1,7 +1,7 @@
 // Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-path: language/expressions/object/method-definition/generator-
+path: language/expressions/object/method-definition/gen-
 name: Generator method
 esid: prod-GeneratorMethod
 info: |

src/generators/non-strict/expression-named.template

@@ -0,0 +1,25 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/expressions/generators/named-
+name: Generator named expression - valid for non-strict only cases
+esid: prod-GeneratorExpression
+info: |
+  14.4 Generator Function Definitions
+
+  GeneratorExpression:
+    function * BindingIdentifier opt ( FormalParameters ) { GeneratorBody }
+---*/
+
+var callCount = 0;
+
+var gen = function *g() {
+  callCount += 1;
+  /*{ body }*/
+};
+
+var iter = gen();
+
+/*{ assertions }*/
+
+assert.sameValue(callCount, 1);

src/generators/non-strict/expression.template

@@ -8,7 +8,7 @@ info: |
   14.4 Generator Function Definitions
 
   GeneratorExpression:
-    function * BindingIdentifier[+Yield, ~Await]opt ( FormalParameters[+Yield, ~Await] ) { GeneratorBody }
+    function * BindingIdentifier opt ( FormalParameters ) { GeneratorBody }
 ---*/
 
 var callCount = 0;

src/generators/non-strict/obj-method.template

@@ -1,14 +1,14 @@
 // Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-path: language/expressions/object/method-definition/generator-
+path: language/expressions/object/method-definition/gen-
 name: Generator method - valid for non-strict only cases
 esid: prod-GeneratorMethod
 info: |
   14.4 Generator Function Definitions
 
   GeneratorMethod[Yield, Await]:
-    * PropertyName[?Yield, ?Await] ( UniqueFormalParameters[+Yield, ~Await] ) { GeneratorBody }
+    * PropertyName ( UniqueFormalParameters ) { GeneratorBody }
 ---*/
 
 var callCount = 0;

src/generators/yield-identifier-spread-non-strict.case

@@ -16,6 +16,8 @@ features: [object-spread]
 flags: [noStrict]
 ---*/
 
+//- setup
+var s = Symbol('s');
 //- body
   yield {
      ...yield yield,
@@ -30,14 +32,18 @@ var iter = gen();
 
 iter.next();
 iter.next();
-iter.next({ x: 10, a: 0, b: 0 });
+iter.next({ x: 10, a: 0, b: 0, [s]: 1 });
-iter.next({ y: 20, a: 1, b: 1 });
+iter.next({ y: 20, a: 1, b: 1, [s]: 42 });
 var item = iter.next({ z: 30, b: 2 });
 
+var value = item.value;
+
 assert.sameValue(item.done, false);
-assert.sameValue(item.value.x, 10);
+assert.sameValue(value.x, 10);
-assert.sameValue(item.value.y, 20);
+assert.sameValue(value.y, 20);
-assert.sameValue(item.value.z, 30);
+assert.sameValue(value.z, 30);
-assert.sameValue(item.value.a, 1);
+assert.sameValue(value.a, 1);
-assert.sameValue(item.value.b, 2);
+assert.sameValue(value.b, 2);
-assert.sameValue(Object.keys(item.value).length, 5);
+assert.sameValue(value[s], 42);
+assert(Object.hasOwnProperty.call(value, s));
+assert.sameValue(Object.keys(value).length, 5);

src/generators/yield-spread-arr-single.case

@@ -9,8 +9,6 @@ info: |
 
   SpreadElement[Yield, Await]:
     ...AssignmentExpression[+In, ?Yield, ?Await]
-includes:
-  - compareArray.js
 ---*/
 
 //- setup
@@ -19,7 +17,13 @@ var arr = ['a', 'b', 'c'];
   yield [...yield];
 //- assertions
 iter.next(false);
-var item = iter.next(['a', 'b', 'c']);
+var item = iter.next(arr);
+var value = item.value;
 
-assert(compareArray(item.value, arr));
+assert.notSameValue(value, arr, 'value is a new array');
+assert(Array.isArray(value), 'value is an Array exotic object');
+assert.sameValue(value.length, 3)
+assert.sameValue(value[0], 'a');
+assert.sameValue(value[1], 'b');
+assert.sameValue(value[2], 'c');
 assert.sameValue(item.done, false);

src/spread/obj-symbol-property.case

@@ -29,6 +29,7 @@ obj
 //- body
 
 assert.sameValue(obj[symbol], 1);
+assert(Object.hasOwnProperty.call(obj, symbol));
 assert.sameValue(obj.c, 4);
 assert.sameValue(obj.d, 5);
 assert.sameValue(Object.keys(obj).length, 2);

test/language/expressions/array/spread-obj-symbol-property.js

@@ -41,6 +41,7 @@ var callCount = 0;
 
 (function(obj) {
   assert.sameValue(obj[symbol], 1);
+  assert(Object.hasOwnProperty.call(obj, symbol));
   assert.sameValue(obj.c, 4);
   assert.sameValue(obj.d, 5);
   assert.sameValue(Object.keys(obj).length, 2);

test/language/expressions/async-generator/named-yield-identifier-non-strict.js

@@ -0,0 +1,45 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-non-strict.case
+// - src/async-generators/non-strict/async-expression-named.template
+/*---
+description: Use of yield as a valid identifier in a function body inside a generator body in non strict mode (Async generator named expression - valid for non-strict only cases)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, noStrict, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+---*/
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  return (function(arg) {
+      var yield = arg + 1;
+      return yield;
+    }(yield))
+};
+
+var iter = gen();
+
+var item = iter.next();
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, false);
+  assert.sameValue(value, undefined);
+});
+
+item = iter.next(42);
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, true);
+  assert.sameValue(value, 43);
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-identifier-spread-non-strict.js

@@ -0,0 +1,63 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-spread-non-strict.case
+// - src/async-generators/non-strict/async-expression-named.template
+/*---
+description: Mixed use of object spread and yield as a valid identifier in a function body inside a generator body in non strict mode (Async generator named expression - valid for non-strict only cases)
+esid: prod-AsyncGeneratorExpression
+features: [object-spread, async-iteration]
+flags: [generated, noStrict, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+var s = Symbol('s');
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield {
+       ...yield yield,
+       ...(function(arg) {
+          var yield = arg;
+          return {...yield};
+       }(yield)),
+       ...yield,
+    }
+};
+
+var iter = gen();
+
+var iter = gen();
+
+iter.next();
+iter.next();
+iter.next({ x: 10, a: 0, b: 0, [s]: 1 });
+iter.next({ y: 20, a: 1, b: 1, [s]: 42 });
+var item = iter.next({ z: 30, b: 2 });
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, false);
+  assert.sameValue(value.x, 10);
+  assert.sameValue(value.y, 20);
+  assert.sameValue(value.z, 30);
+  assert.sameValue(value.a, 1);
+  assert.sameValue(value.b, 2);
+  assert.sameValue(value[s], 42);
+  assert.sameValue(Object.keys(value).length, 5);
+  assert(Object.hasOwnProperty.call(value, s));
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-identifier-spread-strict.js

@@ -0,0 +1,45 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-spread-strict.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: It's an early error if the AssignmentExpression is a function body with yield as an identifier in strict mode. (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [object-spread, async-iteration]
+flags: [generated, onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  return {
+       ...(function() {
+          var yield;
+          throw new Test262Error();
+       }()),
+    }
+};
+
+var iter = gen();
+
+
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-identifier-strict.js

@@ -0,0 +1,36 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-strict.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: It's an early error if the generator body has another function body with yield as an identifier in strict mode. (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+---*/
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  (function() {
+      var yield;
+      throw new Test262Error();
+    }())
+};
+
+var iter = gen();
+
+
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-spread-arr-multiple.js

@@ -0,0 +1,49 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-arr-multiple.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Use yield value in a array spread position (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+includes: [compareArray.js]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    Array Initializer
+
+    SpreadElement[Yield, Await]:
+      ...AssignmentExpression[+In, ?Yield, ?Await]
+
+---*/
+var arr = ['a', 'b', 'c'];
+var item;
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield [...yield yield];
+};
+
+var iter = gen();
+
+iter.next(false);
+item = iter.next(['a', 'b', 'c']);
+
+item.then(({ done, value }) => {
+  item = iter.next(value);
+
+  item.then(({ done, value }) => {
+    assert(compareArray(value, arr));
+    assert.sameValue(done, false);
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-spread-arr-single.js

@@ -0,0 +1,48 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-arr-single.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Use yield value in a array spread position (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 }
+
+
+    Array Initializer
+
+    SpreadElement[Yield, Await]:
+      ...AssignmentExpression[+In, ?Yield, ?Await]
+
+---*/
+var arr = ['a', 'b', 'c'];
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield [...yield];
+};
+
+var iter = gen();
+
+iter.next(false);
+var item = iter.next(arr);
+
+item.then(({ done, value }) => {
+  assert.notSameValue(value, arr, 'value is a new array');
+  assert(Array.isArray(value), 'value is an Array exotic object');
+  assert.sameValue(value.length, 3)
+  assert.sameValue(value[0], 'a');
+  assert.sameValue(value[1], 'b');
+  assert.sameValue(value[2], 'c');
+  assert.sameValue(done, false);
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/named-yield-spread-obj.js

@@ -0,0 +1,52 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-obj.case
+// - src/async-generators/default/async-expression-named.template
+/*---
+description: Use yield value in a object spread position (Named async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [object-spread, async-iteration]
+flags: [generated, async]
+includes: [compareArray.js]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+
+
+var callCount = 0;
+
+var gen = async function *g() {
+  callCount += 1;
+  yield {
+      ...yield,
+      y: 1,
+      ...yield yield,
+    };
+};
+
+var iter = gen();
+
+iter.next();
+iter.next({ x: 42 });
+iter.next({ x: 'lol' });
+var item = iter.next({ y: 39 });
+
+item.then(({ done, value }) => {
+  assert.sameValue(value.x, 42);
+  assert.sameValue(value.y, 39);
+  assert.sameValue(Object.keys(value).length, 2);
+  assert.sameValue(done, false);
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-identifier-non-strict.js

@@ -0,0 +1,45 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-non-strict.case
+// - src/async-generators/non-strict/async-expression.template
+/*---
+description: Use of yield as a valid identifier in a function body inside a generator body in non strict mode (Async generator expression - valid for non-strict only cases)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, noStrict, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+---*/
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  return (function(arg) {
+      var yield = arg + 1;
+      return yield;
+    }(yield))
+};
+
+var iter = gen();
+
+var item = iter.next();
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, false);
+  assert.sameValue(value, undefined);
+});
+
+item = iter.next(42);
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, true);
+  assert.sameValue(value, 43);
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-identifier-spread-non-strict.js

@@ -0,0 +1,63 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-spread-non-strict.case
+// - src/async-generators/non-strict/async-expression.template
+/*---
+description: Mixed use of object spread and yield as a valid identifier in a function body inside a generator body in non strict mode (Async generator expression - valid for non-strict only cases)
+esid: prod-AsyncGeneratorExpression
+features: [object-spread, async-iteration]
+flags: [generated, noStrict, async]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+var s = Symbol('s');
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield {
+       ...yield yield,
+       ...(function(arg) {
+          var yield = arg;
+          return {...yield};
+       }(yield)),
+       ...yield,
+    }
+};
+
+var iter = gen();
+
+var iter = gen();
+
+iter.next();
+iter.next();
+iter.next({ x: 10, a: 0, b: 0, [s]: 1 });
+iter.next({ y: 20, a: 1, b: 1, [s]: 42 });
+var item = iter.next({ z: 30, b: 2 });
+
+item.then(({ done, value }) => {
+  assert.sameValue(done, false);
+  assert.sameValue(value.x, 10);
+  assert.sameValue(value.y, 20);
+  assert.sameValue(value.z, 30);
+  assert.sameValue(value.a, 1);
+  assert.sameValue(value.b, 2);
+  assert.sameValue(value[s], 42);
+  assert.sameValue(Object.keys(value).length, 5);
+  assert(Object.hasOwnProperty.call(value, s));
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-identifier-spread-strict.js

@@ -0,0 +1,45 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-spread-strict.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: It's an early error if the AssignmentExpression is a function body with yield as an identifier in strict mode. (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [object-spread, async-iteration]
+flags: [generated, onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  return {
+       ...(function() {
+          var yield;
+          throw new Test262Error();
+       }()),
+    }
+};
+
+var iter = gen();
+
+
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-identifier-strict.js

@@ -0,0 +1,36 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-strict.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: It's an early error if the generator body has another function body with yield as an identifier in strict mode. (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+---*/
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  (function() {
+      var yield;
+      throw new Test262Error();
+    }())
+};
+
+var iter = gen();
+
+
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-spread-arr-multiple.js

@@ -0,0 +1,49 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-arr-multiple.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Use yield value in a array spread position (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [async-iteration]
+flags: [generated, async]
+includes: [compareArray.js]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    Array Initializer
+
+    SpreadElement[Yield, Await]:
+      ...AssignmentExpression[+In, ?Yield, ?Await]
+
+---*/
+var arr = ['a', 'b', 'c'];
+var item;
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield [...yield yield];
+};
+
+var iter = gen();
+
+iter.next(false);
+item = iter.next(['a', 'b', 'c']);
+
+item.then(({ done, value }) => {
+  item = iter.next(value);
+
+  item.then(({ done, value }) => {
+    assert(compareArray(value, arr));
+    assert.sameValue(done, false);
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-spread-arr-single.js

@@ -0,0 +1,48 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-arr-single.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Use yield value in a array spread position (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 }
+
+
+    Array Initializer
+
+    SpreadElement[Yield, Await]:
+      ...AssignmentExpression[+In, ?Yield, ?Await]
+
+---*/
+var arr = ['a', 'b', 'c'];
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield [...yield];
+};
+
+var iter = gen();
+
+iter.next(false);
+var item = iter.next(arr);
+
+item.then(({ done, value }) => {
+  assert.notSameValue(value, arr, 'value is a new array');
+  assert(Array.isArray(value), 'value is an Array exotic object');
+  assert.sameValue(value.length, 3)
+  assert.sameValue(value[0], 'a');
+  assert.sameValue(value[1], 'b');
+  assert.sameValue(value[2], 'c');
+  assert.sameValue(done, false);
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/async-generator/yield-spread-obj.js

@@ -0,0 +1,52 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-obj.case
+// - src/async-generators/default/async-expression.template
+/*---
+description: Use yield value in a object spread position (Unnamed async generator expression)
+esid: prod-AsyncGeneratorExpression
+features: [object-spread, async-iteration]
+flags: [generated, async]
+includes: [compareArray.js]
+info: |
+    Async Generator Function Definitions
+
+    AsyncGeneratorExpression :
+      async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) {
+        AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+
+
+var callCount = 0;
+
+var gen = async function *() {
+  callCount += 1;
+  yield {
+      ...yield,
+      y: 1,
+      ...yield yield,
+    };
+};
+
+var iter = gen();
+
+iter.next();
+iter.next({ x: 42 });
+iter.next({ x: 'lol' });
+var item = iter.next({ y: 39 });
+
+item.then(({ done, value }) => {
+  assert.sameValue(value.x, 42);
+  assert.sameValue(value.y, 39);
+  assert.sameValue(Object.keys(value).length, 2);
+  assert.sameValue(done, false);
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/call/spread-obj-symbol-property.js

@@ -39,6 +39,7 @@ var callCount = 0;
 
 (function(obj) {
   assert.sameValue(obj[symbol], 1);
+  assert(Object.hasOwnProperty.call(obj, symbol));
   assert.sameValue(obj.c, 4);
   assert.sameValue(obj.d, 5);
   assert.sameValue(Object.keys(obj).length, 2);

test/language/expressions/class/async-gen-method-static-yield-identifier-spread-strict.js

@@ -0,0 +1,52 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-spread-strict.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: It's an early error if the AssignmentExpression is a function body with yield as an identifier in strict mode. (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [object-spread, async-iteration]
+flags: [generated, onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    return {
+         ...(function() {
+            var yield;
+            throw new Test262Error();
+         }()),
+      }
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-identifier-strict.js

@@ -0,0 +1,43 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-strict.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: It's an early error if the generator body has another function body with yield as an identifier in strict mode. (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+---*/
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    (function() {
+        var yield;
+        throw new Test262Error();
+      }())
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-spread-arr-multiple.js

@@ -0,0 +1,56 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-arr-multiple.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Use yield value in a array spread position (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, async]
+includes: [compareArray.js]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    Array Initializer
+
+    SpreadElement[Yield, Await]:
+      ...AssignmentExpression[+In, ?Yield, ?Await]
+
+---*/
+var arr = ['a', 'b', 'c'];
+var item;
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield [...yield yield];
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next(false);
+item = iter.next(['a', 'b', 'c']);
+
+item.then(({ done, value }) => {
+  item = iter.next(value);
+
+  item.then(({ done, value }) => {
+    assert(compareArray(value, arr));
+    assert.sameValue(done, false);
+  }).then($DONE, $DONE);
+}).catch($DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-spread-arr-single.js

@@ -0,0 +1,55 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-arr-single.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Use yield value in a array spread position (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 }
+
+
+    Array Initializer
+
+    SpreadElement[Yield, Await]:
+      ...AssignmentExpression[+In, ?Yield, ?Await]
+
+---*/
+var arr = ['a', 'b', 'c'];
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield [...yield];
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next(false);
+var item = iter.next(arr);
+
+item.then(({ done, value }) => {
+  assert.notSameValue(value, arr, 'value is a new array');
+  assert(Array.isArray(value), 'value is an Array exotic object');
+  assert.sameValue(value.length, 3)
+  assert.sameValue(value[0], 'a');
+  assert.sameValue(value[1], 'b');
+  assert.sameValue(value[2], 'c');
+  assert.sameValue(done, false);
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-static-yield-spread-obj.js

@@ -0,0 +1,59 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-spread-obj.case
+// - src/async-generators/default/async-class-expr-static-method.template
+/*---
+description: Use yield value in a object spread position (Static async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [object-spread, async-iteration]
+flags: [generated, async]
+includes: [compareArray.js]
+info: |
+    ClassElement :
+      static MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+
+
+var callCount = 0;
+
+var C = class { static async *gen() {
+    callCount += 1;
+    yield {
+        ...yield,
+        y: 1,
+        ...yield yield,
+      };
+}}
+
+var gen = C.gen;
+
+var iter = gen();
+
+iter.next();
+iter.next({ x: 42 });
+iter.next({ x: 'lol' });
+var item = iter.next({ y: 39 });
+
+item.then(({ done, value }) => {
+  assert.sameValue(value.x, 42);
+  assert.sameValue(value.y, 39);
+  assert.sameValue(Object.keys(value).length, 2);
+  assert.sameValue(done, false);
+}).then($DONE, $DONE);
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-identifier-spread-strict.js

@@ -0,0 +1,52 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-spread-strict.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: It's an early error if the AssignmentExpression is a function body with yield as an identifier in strict mode. (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [object-spread, async-iteration]
+flags: [generated, onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+
+    Spread Properties
+
+    PropertyDefinition[Yield]:
+      (...)
+      ...AssignmentExpression[In, ?Yield]
+
+---*/
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    return {
+         ...(function() {
+            var yield;
+            throw new Test262Error();
+         }()),
+      }
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+
+
+assert.sameValue(callCount, 1);

test/language/expressions/class/async-gen-method-yield-identifier-strict.js

@@ -0,0 +1,43 @@
+// This file was procedurally generated from the following sources:
+// - src/async-generators/yield-identifier-strict.case
+// - src/async-generators/default/async-class-expr-method.template
+/*---
+description: It's an early error if the generator body has another function body with yield as an identifier in strict mode. (Async generator method as a ClassExpression element)
+esid: prod-AsyncGeneratorMethod
+features: [async-iteration]
+flags: [generated, onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+info: |
+    ClassElement :
+      MethodDefinition
+
+    MethodDefinition :
+      AsyncGeneratorMethod
+
+    Async Generator Function Definitions
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+---*/
+
+
+var callCount = 0;
+
+var C = class { async *gen() {
+    callCount += 1;
+    (function() {
+        var yield;
+        throw new Test262Error();
+      }())
+}}
+
+var gen = C.prototype.gen;
+
+var iter = gen();
+
+
+
+assert.sameValue(callCount, 1);