for-await-of: dstr-assignment, cases

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

src/dstr-assignment-async-iteration/array-elem-init-assignment.case

@@ -9,7 +9,7 @@ template: default
 ---*/
 
 //- setup
-var v2, vNull, vHole, vUndefined, vOob;
+let v2, vNull, vHole, vUndefined, vOob;
 //- elems
 [v2 = 10, vNull = 11, vHole = 12, vUndefined = 13, vOob = 14]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-evaluation.case

@@ -8,8 +8,8 @@ template: default
 ---*/
 
 //- setup
-var flag1 = false, flag2 = false;
+let flag1 = false, flag2 = false;
-var _;
+let _;
 //- elems
 [ _ = flag1 = true, _ = flag2 = true ]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-fn-name-arrow.case

@@ -11,15 +11,13 @@ info: >
     7. If Initializer is present and value is undefined and
        IsAnonymousFunctionDefinition(Initializer) and IsIdentifierRef of
        DestructuringAssignmentTarget are both true, then
-       a. Let hasNameProperty be HasOwnProperty(v, "name").
+       a. Let hasNameProperty be ? HasOwnProperty(v, "name").
-       b. ReturnIfAbrupt(hasNameProperty).
+       b. If hasNameProperty is false, perform SetFunctionName(v, GetReferencedName(lref)).
-       c. If hasNameProperty is false, perform SetFunctionName(v,
-          GetReferencedName(lref)).
 includes: [propertyHelper.js]
 ---*/
 
 //- setup
-var arrow;
+let arrow;
 //- elems
 [ arrow = () => {} ]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-fn-name-class.case

@@ -11,16 +11,14 @@ info: >
     7. If Initializer is present and value is undefined and
        IsAnonymousFunctionDefinition(Initializer) and IsIdentifierRef of
        DestructuringAssignmentTarget are both true, then
-       a. Let hasNameProperty be HasOwnProperty(v, "name").
+       a. Let hasNameProperty be ? HasOwnProperty(v, "name").
-       b. ReturnIfAbrupt(hasNameProperty).
+       b. If hasNameProperty is false, perform SetFunctionName(v, GetReferencedName(lref)).
-       c. If hasNameProperty is false, perform SetFunctionName(v,
-          GetReferencedName(lref)).
 includes: [propertyHelper.js]
 features: [class]
 ---*/
 
 //- setup
-var xCls, cls, xCls2;
+let xCls, cls, xCls2;
 //- elems
 [ xCls = class x {}, cls = class {}, xCls2 = class { static name() {} } ]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-fn-name-cover.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -12,15 +12,13 @@ info: >
     7. If Initializer is present and value is undefined and
        IsAnonymousFunctionDefinition(Initializer) and IsIdentifierRef of
        DestructuringAssignmentTarget are both true, then
-       a. Let hasNameProperty be HasOwnProperty(v, "name").
+       a. Let hasNameProperty be ? HasOwnProperty(v, "name").
-       b. ReturnIfAbrupt(hasNameProperty).
+       b. If hasNameProperty is false, perform SetFunctionName(v, GetReferencedName(lref)).
-       c. If hasNameProperty is false, perform SetFunctionName(v,
-          GetReferencedName(lref)).
 includes: [propertyHelper.js]
 ---*/
 
 //- setup
-var xCover, cover;
+let xCover, cover;
 //- elems
 [ xCover = (0, function() {}), cover = (function() {}) ]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-fn-name-fn.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,27 +11,25 @@ info: >
     7. If Initializer is present and value is undefined and
        IsAnonymousFunctionDefinition(Initializer) and IsIdentifierRef of
        DestructuringAssignmentTarget are both true, then
-       a. Let hasNameProperty be HasOwnProperty(v, "name").
+       a. Let hasNameProperty be ? HasOwnProperty(v, "name").
-       b. ReturnIfAbrupt(hasNameProperty).
+       b. If hasNameProperty is false, perform SetFunctionName(v, GetReferencedName(lref)).
-       c. If hasNameProperty is false, perform SetFunctionName(v,
-          GetReferencedName(lref)).
 includes: [propertyHelper.js]
 features: [class]
 ---*/
 
 //- setup
-var xFn, fn;
+let xFnexp, fnexp;
 //- elems
-[ xFn = function x() {}, fn = function() {} ]
+[ xFnexp = function x() {}, fnexp = function() {} ]
 //- vals
 []
 //- body
-assert(xFn.name !== 'xFn');
+assert(xFnexp.name !== 'xFnexp');
 
-assert.sameValue(fn.name, 'fn');
+assert.sameValue(fnexp.name, 'fnexp');
-verifyNotEnumerable(fn, 'name');
+verifyNotEnumerable(fnexp, 'name');
-verifyNotWritable(fn, 'name');
+verifyNotWritable(fnexp, 'name');
-verifyConfigurable(fn, 'name');
+verifyConfigurable(fnexp, 'name');
 
 //- teardown
 promise

src/dstr-assignment-async-iteration/array-elem-init-fn-name-gen.case

@@ -11,16 +11,14 @@ info: >
     7. If Initializer is present and value is undefined and
        IsAnonymousFunctionDefinition(Initializer) and IsIdentifierRef of
        DestructuringAssignmentTarget are both true, then
-       a. Let hasNameProperty be HasOwnProperty(v, "name").
+       a. Let hasNameProperty be ? HasOwnProperty(v, "name").
-       b. ReturnIfAbrupt(hasNameProperty).
+       b. If hasNameProperty is false, perform SetFunctionName(v, GetReferencedName(lref)).
-       c. If hasNameProperty is false, perform SetFunctionName(v,
-          GetReferencedName(lref)).
 includes: [propertyHelper.js]
 features: [generators]
 ---*/
 
 //- setup
-var xGen, gen;
+let xGen, gen;
 //- elems
 [ xGen = function* x() {}, gen = function*() {} ]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-in.case

@@ -8,7 +8,7 @@ template: default
 ---*/
 
 //- setup
-var x;
+let x;
 //- elems
 [ x = 'x' in {} ]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-let.case

@@ -0,0 +1,24 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    Value retrieval of Initializer obeys `let` semantics.
+template: default
+es6id: 12.14.5.3
+features: [let]
+---*/
+
+//- setup
+let x;
+//- elems
+[ x = y ]
+//- vals
+[]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(constructor, ReferenceError);
+}).then($DONE, $DONE);
+
+let y;
+

src/dstr-assignment-async-iteration/array-elem-init-order.case

@@ -8,8 +8,8 @@ template: default
 ---*/
 
 //- setup
-var x = 0;
+let x = 0;
-var a, b;
+let a, b;
 //- elems
 [ a = x += 1, b = x *= 2 ]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-simple-no-strict.case

@@ -11,7 +11,7 @@ flags: [noStrict]
 ---*/
 
 //- setup
-var argument, eval;
+let argument, eval;
 //- elems
 [arguments = 4, eval = 5]
 //- vals

src/dstr-assignment-async-iteration/array-elem-init-yield-expr.case

@@ -0,0 +1,32 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When a `yield` token appears within the Initializer of an
+    AssignmentElement within a generator function body, it behaves as a
+    YieldExpression.
+template: async-generator
+es6id: 12.14.5.4
+features: [generators]
+---*/
+
+//- setup
+let value = [];
+let x;
+//- elems
+[ x = yield ]
+//- vals
+[]
+//- teardown
+iter.next().then(result => {
+  assert.sameValue(result.value, undefined);
+  assert.sameValue(result.done, false);
+  assert.sameValue(x, undefined);
+
+  iter.next(4).then(result => {
+    assert.sameValue(result.value, undefined);
+    assert.sameValue(result.done, true);
+    assert.sameValue(x, 4);
+  }, $DONE).then($DONE, $DONE);
+}, $DONE).catch($DONE);

src/dstr-assignment-async-iteration/array-elem-init-yield-ident-invalid.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: >
+    When a `yield` token appears within the Initializer of an AssignmentElement
+    outside of a generator function body, it behaves as an IdentifierReference.
+template: error-async-function-syntax
+es6id: 12.14.5.4
+flags: [onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- elems
+[ x = yield ]
+//- vals
+[]

src/dstr-assignment-async-iteration/array-elem-init-yield-ident-valid.case

@@ -0,0 +1,26 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When a `yield` token appears within the Initializer of an AssignmentElement
+    outside of a generator function body, it behaves as an IdentifierReference.
+template: async-function
+es6id: 12.14.5.4
+flags: [noStrict]
+---*/
+
+//- setup
+let yield = 4;
+let x;
+//- elems
+[ x = yield ]
+//- vals
+[]
+//- body
+assert.sameValue(x, 4);
+
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-iter-get-err.case

@@ -0,0 +1,32 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Abrupt completion returned from GetIterator
+info: |
+    ArrayAssignmentPattern : [ AssignmentElementList ]
+
+    1. Let iterator be ? GetIterator(value).
+
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let iterable = {
+  [Symbol.iterator]() {
+    throw new Test262Error();
+  }
+};
+let _;
+
+//- elems
+[ _ ]
+//- vals
+iterable
+//- teardown
+iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elem-iter-nrml-close-err.case

@@ -0,0 +1,47 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Abrupt completion returned from IteratorClose
+info: |
+    ArrayAssignmentPattern : [ AssignmentElementList ]
+
+    [...]
+    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
+
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let returnCount = 0;
+let _;
+let iterator = {
+  next() {
+    nextCount += 1;
+    // Set an upper-bound to limit unnecessary iteration in non-conformant
+    // implementations
+    return { done: nextCount > 10 };
+  },
+  return() {
+    returnCount += 1;
+    throw new Test262Error();
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+//- elems
+[ _ ]
+//- vals
+iterable
+//- teardown
+iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(nextCount, 1);
+  assert.sameValue(returnCount, 1);
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-iter-nrml-close-null.case

@@ -0,0 +1,55 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose throws a TypeError when `return` returns a non-Object value
+info: |
+    ArrayAssignmentPattern : [ AssignmentElementList ]
+
+    [...]
+    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
+    5. Return result.
+
+    7.4.6 IteratorClose( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
+    6. If completion.[[Type]] is throw, return Completion(completion).
+    7. If innerResult.[[Type]] is throw, return Completion(innerResult).
+    8. If Type(innerResult.[[Value]]) is not Object, throw a TypeError exception.
+
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let _;
+let nextCount = 0;
+let iterator = {
+  next() {
+    nextCount += 1;
+    // Set an upper-bound to limit unnecessary iteration in non-conformant
+    // implementations
+    return { done: nextCount > 10 };
+  },
+  return() {
+    return null;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+//- elems
+[ _ ]
+//- vals
+iterable
+//- teardown
+iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(nextCount, 1);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elem-iter-nrml-close-skip.case

@@ -8,30 +8,31 @@ info: |
     ArrayAssignmentPattern : [ AssignmentElementList ]
 
     [...]
-    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, result).
+    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
-    6. Return result.
+    5. Return result.
 features: [Symbol.iterator]
-template: default
+template: async-generator
 esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var _;
+let _;
-var iterable = {};
+let iterator = {
-var iterator = {
+  next() {
-  next: function() {
     nextCount += 1;
     return { done: true };
   },
-  return: function() {
+  return() {
     returnCount += 1;
     return {};
   }
 };
-iterable[Symbol.iterator] = function() {
+let iterable = {
+  [Symbol.iterator]() {
     return iterator;
+  }
 };
 //- elems
 [ _ ]
@@ -42,6 +43,6 @@ assert.sameValue(nextCount, 1);
 assert.sameValue(returnCount, 0);
 
 //- teardown
-promise
+iter.next().then(() => {
-  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  assert.sameValue(iterCount, 1);
-  .then($DONE, $DONE);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-iter-nrml-close.case

@@ -8,14 +8,13 @@ info: |
     ArrayAssignmentPattern : [ AssignmentElementList ]
 
     [...]
-    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
-       result).
+    5. Return result.
-    6. Return result.
 
-    7.4.6 IteratorClose( iterator, completion )
+    7.4.6 IteratorClose ( iterator, completion )
 
     [...]
-    6. Let innerResult be Call(return, iterator, « »).
+    5. Let innerResult be Call(return, iterator, « »).
     [...]
 features: [Symbol.iterator]
 template: default
@@ -23,20 +22,20 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var thisValue = null;
+let thisValue = null;
-var args = null;
+let args = null;
-var _;
+let _;
-var iterable = {};
+let iterable = {};
-var iterator = {
+let iterator = {
-  next: function() {
+  next() {
     nextCount += 1;
     // Set an upper-bound to limit unnecessary iteration in non-conformant
     // implementations
     return { done: nextCount > 10 };
   },
-  return: function() {
+  return() {
     returnCount += 1;
     thisValue = this;
     args = arguments;

src/dstr-assignment-async-iteration/array-elem-iter-rtrn-close-null.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: >
+    IteratorClose throws a TypeError when `return` returns a non-Object value
+info: |
+    ArrayAssignmentPattern : [ AssignmentElementList ]
+
+    [...]
+    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
+    5. Return result.
+
+    7.4.6 IteratorClose( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
+    6. If completion.[[Type]] is throw, return Completion(completion).
+    7. If innerResult.[[Type]] is throw, return Completion(innerResult).
+    8. If Type(innerResult.[[Value]]) is not Object, throw a TypeError exception.
+
+features: [Symbol.iterator, generators]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let unreachable = 0;
+let iterator = {
+  return() {
+    return null;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+//- elems
+[ {}[yield] ]
+//- vals
+iterable
+//- body
+unreachable += 1;
+//- teardown
+iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(unreachable, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-iter-thrw-close-skip.case

@@ -0,0 +1,46 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose is not called when iteration produces an abrupt completion
+info: |
+    ArrayAssignmentPattern : [ AssignmentElementList ]
+
+    [...]
+    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
+    5. Return result.
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let returnCount = 0;
+let iterator = {
+  next() {
+    nextCount += 1;
+    throw new Test262Error();
+  },
+  return() {
+    returnCount += 1;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+let _;
+
+//- elems
+[ x ]
+//- vals
+iterable
+//- teardown
+iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(nextCount, 1);
+  assert.sameValue(returnCount, 0);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elem-nested-array-invalid.case

@@ -0,0 +1,20 @@
+// 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 is a Syntax Error if LeftHandSideExpression is either an ObjectLiteral
+    or an ArrayLiteral and if the lexical token sequence matched by
+    LeftHandSideExpression cannot be parsed with no tokens left over using
+    AssignmentPattern as the goal symbol.
+template: error-async-function-syntax
+es6id: 12.14.5.1
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- elems
+[[(x, y)]]
+//- vals
+[[]]

src/dstr-assignment-async-iteration/array-elem-nested-array-null.case

@@ -0,0 +1,24 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an array literal and the value is
+    `null`, a TypeError should be thrown.
+template: default
+es6id: 12.14.5.3
+---*/
+
+//- setup
+let _;
+
+//- elems
+[[ _ ]]
+//- vals
+[null]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elem-nested-array-undefined-hole.case

@@ -0,0 +1,24 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an array literal and the value is a
+    "hole", a TypeError should be thrown.
+template: default
+es6id: 12.14.5.3
+---*/
+
+//- setup
+let _;
+
+//- elems
+[[ _ ]]
+//- vals
+[ , ]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elem-nested-array-undefined-own.case

@@ -0,0 +1,24 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an array literal and the value is
+    `undefined`, a TypeError should be thrown.
+template: default
+es6id: 12.14.5.3
+---*/
+
+//- setup
+let _;
+
+//- elems
+[[ x ]]
+//- vals
+[undefined]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elem-nested-array-undefined.case

@@ -0,0 +1,23 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an array literal and no value is
+    defined, a TypeError should be thrown.
+template: default
+es6id: 12.14.5.3
+---*/
+
+//- setup
+let _;
+//- elems
+[[ x ]]
+//- vals
+[]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elem-nested-array-yield-expr.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: >
+    When a `yield` token appears within the DestructuringAssignmentTarget of a
+    nested destructuring assignment and within a generator function body, it
+    behaves as a YieldExpression.
+template: async-generator
+es6id: 12.14.5.3
+features: [generators]
+---*/
+
+//- setup
+let value = [[22]];
+let x = {};
+
+//- elems
+[[x[yield]]]
+//- vals
+value
+//- teardown
+iter.next().then(result => {
+  assert.sameValue(result.value, undefined);
+  assert.sameValue(result.done, false);
+  assert.sameValue(x.prop, undefined);
+
+  iter.next('prop').then(result => {
+    assert.sameValue(result.value, undefined);
+    assert.sameValue(result.done, true);
+    assert.sameValue(x.prop, 22);
+  }, $DONE).then($DONE, $DONE);
+}, $DONE).catch($DONE);

src/dstr-assignment-async-iteration/array-elem-nested-array-yield-ident-invalid.case

@@ -0,0 +1,20 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When a `yield` token appears within the DestructuringAssignmentTarget of a
+    nested destructuring assignment outside of strict mode, it behaves as an
+    IdentifierReference.
+template: error-async-function-syntax
+es6id: 12.14.5.3
+flags: [onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- elems
+[[x[yield]]]
+//- vals
+[[]]

src/dstr-assignment-async-iteration/array-elem-nested-array-yield-ident-valid.case

@@ -6,16 +6,20 @@ desc: >
     When a `yield` token appears within the DestructuringAssignmentTarget of a
     nested destructuring assignment outside of strict mode, it behaves as an
     IdentifierReference.
-template: default
+template: async-function
 flags: [noStrict]
 ---*/
 
 //- setup
-var yield = 'prop';
+let yield = 'prop';
-var x = {};
+let x = {};
 //- elems
 [[x[yield]]]
 //- vals
 [[22]]
 //- body
 assert.sameValue(x.prop, 22);
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-nested-array.case

@@ -6,14 +6,18 @@ desc: >
     When DestructuringAssignmentTarget is an array literal, it should be parsed
     parsed as a DestructuringAssignmentPattern and evaluated as a destructuring
     assignment.
-template: default
+template: async-function
 ---*/
 
 //- setup
-var x;
+let x;
 //- elems
 [[x]]
 //- vals
 [[1]]
 //- body
 assert.sameValue(x, 1);
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-nested-obj-invalid.case

@@ -0,0 +1,20 @@
+// 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 is a Syntax Error if LeftHandSideExpression is either an ObjectLiteral
+    or an ArrayLiteral and if the lexical token sequence matched by
+    LeftHandSideExpression cannot be parsed with no tokens left over using
+    AssignmentPattern as the goal symbol.
+template: error-async-function-syntax
+es6id: 12.14.5.1
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- elems
+[{ get x() {} }]
+//- vals
+[{}]

src/dstr-assignment-async-iteration/array-elem-nested-obj-null.case

@@ -0,0 +1,22 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an object literal and the value is
+    `null`, a TypeError should be thrown.
+template: default
+es6id: 12.14.5.3
+---*/
+
+//- setup
+let x;
+//- elems
+[{ x }]
+//- vals
+[null]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-nested-obj-undefined-hole.case

@@ -0,0 +1,24 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an object literal and the value is a
+    "hole", a TypeError should be thrown.
+template: default
+es6id: 12.14.5.3
+
+---*/
+
+//- setup
+let x;
+
+//- elems
+[{ x }]
+//- vals
+[ , ]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-nested-obj-undefined-own.case

@@ -0,0 +1,24 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an object literal and the value is
+    `undefined`, a TypeError should be thrown.
+template: default
+es6id: 12.14.5.3
+
+---*/
+
+//- setup
+let x;
+
+//- elems
+[{ x }]
+//- vals
+[undefined]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-nested-obj-undefined.case

@@ -0,0 +1,23 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an object literal and no value is
+    defined, a TypeError should be thrown.
+template: default
+es6id: 12.14.5.3
+---*/
+
+//- setup
+let x;
+
+//- elems
+[{ x }]
+//- vals
+[]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-nested-obj-yield-expr.case

@@ -10,7 +10,7 @@ template: async-generator
 ---*/
 
 //- setup
-var x;
+let x;
 
 
 //- elems
@@ -18,14 +18,14 @@ var x;
 //- vals
 [{}]
 //- teardown
-iter.next().then(iterationResult => {
+iter.next().then(result => {
-  assert.sameValue(iterationResult.value, undefined);
+  assert.sameValue(result.value, undefined);
-  assert.sameValue(iterationResult.done, false);
+  assert.sameValue(result.done, false);
   assert.sameValue(x, undefined);
 
-  iter.next(4).then(iterationResult => {
+  iter.next(4).then(result => {
-    assert.sameValue(iterationResult.value, undefined);
+    assert.sameValue(result.value, undefined);
-    assert.sameValue(iterationResult.done, true);
+    assert.sameValue(result.done, true);
     assert.sameValue(x, 4);
   }, $DONE).then($DONE, $DONE);
 }, $DONE).catch($DONE);

src/dstr-assignment-async-iteration/array-elem-nested-obj-yield-ident-invalid.case

@@ -0,0 +1,20 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When a `yield` token appears within the Initializer of a nested
+    destructuring assignment outside of a generator function body, it behaves
+    as a IdentifierReference.
+template: error-async-function-syntax
+es6id: 12.14.5.3
+flags: [onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- elems
+[{ x = yield }]
+//- vals
+[{}]

src/dstr-assignment-async-iteration/array-elem-nested-obj-yield-ident-valid.case

@@ -11,8 +11,8 @@ flags: [noStrict]
 ---*/
 
 //- setup
-var yield = 2;
+let yield = 2;
-var x;
+let x;
 //- elems
 [{ x = yield }]
 //- vals

src/dstr-assignment-async-iteration/array-elem-nested-obj.case

@@ -10,7 +10,7 @@ template: default
 ---*/
 
 //- setup
-var x;
+let x;
 //- elems
 [{ x }]
 //- vals

src/dstr-assignment-async-iteration/array-elem-put-const.case

@@ -0,0 +1,17 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    The assignment target should obey `const` semantics.
+template: default
+es6id: 12.14.5.3
+features: [const]
+---*/
+
+//- setup
+const c = null;
+//- elems
+[ c ]
+//- vals
+[1]

src/dstr-assignment-async-iteration/array-elem-put-let.case

@@ -0,0 +1,22 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    The assignment target should obey `let` semantics.
+template: default
+es6id: 12.14.5.3
+features: [let]
+---*/
+
+//- elems
+[ x ]
+//- vals
+[]
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, ReferenceError);
+}).then($DONE, $DONE);
+
+let x;

src/dstr-assignment-async-iteration/array-elem-put-prop-ref-no-get.case

@@ -9,7 +9,7 @@ template: default
 ---*/
 
 //- setup
-var x, setValue;
+let x, setValue;
 x = {
   get y() {
     $ERROR('The property should not be accessed.');

src/dstr-assignment-async-iteration/array-elem-put-prop-ref-user-err.case

@@ -0,0 +1,27 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    Any error raised as a result of setting the value should be forwarded to
+    the runtime.
+template: default
+es6id: 12.14.5.3
+---*/
+
+//- setup
+let x = {
+  set y(val) {
+    throw new Test262Error();
+  }
+};
+//- elems
+[x.y]
+//- vals
+[23]
+
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-put-prop-ref.case

@@ -9,7 +9,7 @@ template: default
 ---*/
 
 //- setup
-var x = {};
+let x = {};
 //- elems
 [x.y]
 //- vals

src/dstr-assignment-async-iteration/array-elem-put-unresolvable-strict.case

@@ -0,0 +1,22 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    In strict mode, if the the assignment target is an unresolvable reference,
+    a ReferenceError should be thrown.
+template: default
+es6id: 12.14.5.3
+flags: [onlyStrict]
+---*/
+
+//- elems
+[ unresolvable ]
+//- vals
+[]
+
+//- teardown
+promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, ReferenceError);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-target-identifier.case

@@ -10,7 +10,7 @@ template: async-function
 ---*/
 
 //- setup
-var x, y, z;
+let x, y, z;
 //- elems
 [x, y, z]
 //- vals

src/dstr-assignment-async-iteration/array-elem-target-simple-no-strict.case

@@ -11,7 +11,7 @@ flags: [noStrict]
 ---*/
 
 //- setup
-var argument, eval;
+let argument, eval;
 //- elems
 [arguments, eval]
 //- vals

src/dstr-assignment-async-iteration/array-elem-target-simple-strict.case

@@ -0,0 +1,21 @@
+// 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 is a Syntax Error if LeftHandSideExpression is neither an
+    ObjectLiteral nor an ArrayLiteral and
+    IsValidSimpleAssignmentTarget(LeftHandSideExpression) is
+    false.
+template: error-async-function-syntax
+es6id: 12.14.5.1
+flags: [onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- elems
+[arguments]
+//- vals
+[]

src/dstr-assignment-async-iteration/array-elem-target-yield-expr.case

@@ -11,9 +11,9 @@ features: [generators]
 ---*/
 
 //- setup
-var value = [33];
+let value = [33];
-var x = {};
+let x = {};
-var iterationResult;
+let iterationResult;
 
 //- elems
 [ x[yield] ]
@@ -27,8 +27,6 @@ iter.next().then(iterationResult => {
   assert.sameValue(iterationResult.done, false);
   assert.sameValue(x.prop, undefined);
 
-  // TODO add iterCount
-  //
   iter.next('prop').then(iterationResult => {
     assert.sameValue(iterationResult.value, undefined);
     assert.sameValue(iterationResult.done, true);

src/dstr-assignment-async-iteration/array-elem-target-yield-invalid.case

@@ -0,0 +1,20 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When a `yield` token appears within the DestructuringAssignmentTarget of an
+    AssignmentElement and outside of a generator function body, it behaves as
+    an IdentifierReference.
+template: error-async-function-syntax
+es6id: 12.14.5.4
+flags: [onlyStrict]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+//- elems
+[ x[yield] ]
+//- vals
+[]

src/dstr-assignment-async-iteration/array-elem-target-yield-valid.case

@@ -11,8 +11,8 @@ flags: [noStrict]
 ---*/
 
 //- setup
-var yield = 'prop';
+let yield = 'prop';
-var x = {};
+let x = {};
 //- elems
 [ x[yield] ]
 //- vals

src/dstr-assignment-async-iteration/array-elem-trlg-iter-elision-iter-abpt.case

@@ -0,0 +1,63 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Abrupt completion returned during evaluation of elision
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    6. If Elision is present, then
+       a. Let status be the result of performing
+          IteratorDestructuringAssignmentEvaluation of Elision with
+          iteratorRecord as the argument.
+       b. If status is an abrupt completion, then
+          i. If iteratorRecord.[[done]] is false, return
+             IteratorClose(iterator, status).
+          ii. Return Completion(status).
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let returnCount = 0;
+let x;
+let iterator = {
+  next() {
+    nextCount += 1;
+
+    if (nextCount === 2) {
+      throw new Test262Error();
+    }
+
+    // Set an upper-bound to limit unnecessary iteration in non-conformant
+    // implementations
+    return { done: nextCount > 10 };
+  },
+  return() {
+    returnCount += 1;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+//- elems
+[ x , , ]
+//- vals
+iterable
+//- teardown
+
+iter.next().then(() => {
+  iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+    assert.sameValue(nextCount, 2);
+    assert.sameValue(returnCount, 0);
+    assert.sameValue(constructor, Test262Error);
+
+  }).then($DONE, $DONE);
+}, $DONE);

src/dstr-assignment-async-iteration/array-elem-trlg-iter-elision-iter-nrml-close-err.case

@@ -0,0 +1,60 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Abrupt completion returned from IteratorClose
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    6. If Elision is present, then
+       a. Let status be the result of performing
+          IteratorDestructuringAssignmentEvaluation of Elision with
+          iteratorRecord as the argument.
+       b. If status is an abrupt completion, then
+          [...]
+    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+       status).
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let returnCount = 0;
+let x;
+let iterator = {
+  next() {
+    nextCount += 1;
+
+    // Set an upper-bound to limit unnecessary iteration in non-conformant
+    // implementations
+    return { done: nextCount > 10 };
+  },
+  return() {
+    returnCount += 1;
+    throw new Test262Error();
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+//- elems
+[ x , , ]
+//- vals
+iterable
+//- teardown
+iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(nextCount, 2);
+  assert.sameValue(returnCount, 1);
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);
+
+
+

src/dstr-assignment-async-iteration/array-elem-trlg-iter-elision-iter-nrml-close-null.case

@@ -0,0 +1,59 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose throws a TypeError when `return` returns a non-Object value
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    6. If Elision is present, then
+       a. Let status be the result of performing
+          IteratorDestructuringAssignmentEvaluation of Elision with
+          iteratorRecord as the argument.
+       b. If status is an abrupt completion, then
+          [...]
+    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+       status).
+
+    7.4.6 IteratorClose( iterator, completion )
+
+    [...]
+    6. Let innerResult be Call(return, iterator, « »).
+    7. If completion.[[type]] is throw, return Completion(completion).
+    8. If innerResult.[[type]] is throw, return Completion(innerResult).
+    9. If Type(innerResult.[[value]]) is not Object, throw a TypeError
+       exception.
+features: [Symbol.iterator]
+template: default
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let x;
+let nextCount = 0;
+let iterator = {
+  next() {
+    nextCount += 1;
+    // Set an upper-bound to limit unnecessary iteration in non-conformant
+    // implementations
+    return { done: nextCount > 10 };
+  },
+  return() {
+    return null;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+//- error
+TypeError
+//- elems
+[ x , , ]
+//- vals
+iterable

src/dstr-assignment-async-iteration/array-elem-trlg-iter-elision-iter-nrml-close-skip.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: IteratorClose not invoked when elision exhausts the iterator
@@ -7,13 +7,15 @@ info: |
         [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
 
     [...]
-    6. If Elision is present, then
+    5. If Elision is present, then
        a. Let status be the result of performing
           IteratorDestructuringAssignmentEvaluation of Elision with
           iteratorRecord as the argument.
        b. If status is an abrupt completion, then
+
     [...]
-    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+
+    7. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
        status).
     9. Return Completion(status).
 features: [Symbol.iterator]
@@ -22,10 +24,10 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var x;
+let x;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
 
@@ -35,7 +37,7 @@ var iterator = {
     returnCount += 1;
   }
 };
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }

src/dstr-assignment-async-iteration/array-elem-trlg-iter-elision-iter-nrml-close.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: IteratorClose invoked when elision does not exhaust the iterator
@@ -7,19 +7,21 @@ info: |
         [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
 
     [...]
-    6. If Elision is present, then
+    5. If Elision is present, then
        a. Let status be the result of performing
           IteratorDestructuringAssignmentEvaluation of Elision with
           iteratorRecord as the argument.
        b. If status is an abrupt completion, then
+
     [...]
-    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+
+    7. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
        status).
 
-    7.4.6 IteratorClose( iterator, completion )
+    7.4.6 IteratorClose ( iterator, completion )
 
     [...]
-    6. Let innerResult be Call(return, iterator, « »).
+    5. Let innerResult be Call(return, iterator, « »).
     [...]
 features: [Symbol.iterator]
 template: async-generator
@@ -27,12 +29,12 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var thisValue = null;
+let thisValue = null;
-var args = null;
+let args = null;
-var x;
+let x;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
 
@@ -47,7 +49,7 @@ var iterator = {
     return {};
   }
 };
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }

src/dstr-assignment-async-iteration/array-elem-trlg-iter-get-err.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: Abrupt completion returned from GetIterator
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    1. Let iterator be GetIterator(value).
+    2. ReturnIfAbrupt(iterator).
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let iterable = {
+  [Symbol.iterator]() {
+    throw new Test262Error();
+  }
+};
+let x;
+//- elems
+[ x , ]
+//- vals
+iterable
+
+//- teardown
+iter.return().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-trlg-iter-list-nrml-close-err.case

@@ -0,0 +1,59 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Abrupt completion returned from IteratorClose
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    2. Let iteratorRecord be Record {[[Iterator]]: iterator, [[Done]]: false}.
+    3. Let status be the result of performing
+       IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
+       iteratorRecord as the argument.
+    4. If status is an abrupt completion, then
+       a. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status).
+       b. Return Completion(status).
+
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let returnCount = 0;
+let thrower = function() {
+  throw new Test262Error();
+};
+let x;
+let iterator = {
+  next() {
+    nextCount += 1;
+    return { done: nextCount > 10 };
+  },
+  return() {
+    returnCount += 1;
+    throw new Test262Error();
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+//- error
+Test262Error
+//- elems
+[ x , ]
+//- vals
+iterable
+//- teardown
+iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(nextCount, 1);
+  assert.sameValue(returnCount, 1);
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);
+
+

src/dstr-assignment-async-iteration/array-elem-trlg-iter-list-nrml-close-null.case

@@ -0,0 +1,65 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose throws a TypeError when `return` returns a non-Object value
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    2. Let iteratorRecord be Record {[[Iterator]]: iterator, [[Done]]: false}.
+    3. Let status be the result of performing
+       IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
+       iteratorRecord as the argument.
+    4. If status is an abrupt completion, then
+       a. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status).
+       b. Return Completion(status).
+
+    7.4.6 IteratorClose( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
+    6. If completion.[[type]] is throw, return Completion(completion).
+    7. If innerResult.[[type]] is throw, return Completion(innerResult).
+    8. If Type(innerResult.[[value]]) is not Object, throw a TypeError
+       exception.
+
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let x;
+let nextCount = 0;
+let iterator = {
+  next() {
+    nextCount += 1;
+    // Set an upper-bound to limit unnecessary iteration in non-conformant
+    // implementations
+    return { done: nextCount > 10 };
+  },
+  return() {
+    return null;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+//- error
+TypeError
+//- elems
+[ x , ]
+//- vals
+iterable
+//- teardown
+iter.return().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elem-trlg-iter-list-nrml-close-skip.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: >
@@ -9,11 +9,11 @@ info: |
         [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
 
     [...]
-    3. Let iteratorRecord be Record {[[iterator]]: iterator, [[done]]: false}.
+    2. Let iteratorRecord be Record {[[iterator]]: iterator, [[done]]: false}.
-    4. Let status be the result of performing
+    3. Let status be the result of performing
        IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
        iteratorRecord as the argument.
-    5. If status is an abrupt completion, then
+    4. If status is an abrupt completion, then
        a. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
           status).
        b. Return Completion(status).
@@ -23,13 +23,13 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var thrower = function() {
+let thrower = function() {
   throw new Test262Error();
 };
-var x;
+let x;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
     return { done: true };
@@ -38,7 +38,7 @@ var iterator = {
     returnCount += 1;
   }
 };
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }

src/dstr-assignment-async-iteration/array-elem-trlg-iter-list-nrml-close.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: >
@@ -9,19 +9,19 @@ info: |
         [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
 
     [...]
-    3. Let iteratorRecord be Record {[[iterator]]: iterator, [[done]]: false}.
+    2. Let iteratorRecord be Record {[[iterator]]: iterator, [[done]]: false}.
-    4. Let status be the result of performing
+    3. Let status be the result of performing
        IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
        iteratorRecord as the argument.
-    5. If status is an abrupt completion, then
+    4. If status is an abrupt completion, then
        a. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
           status).
        b. Return Completion(status).
 
-    7.4.6 IteratorClose( iterator, completion )
+    7.4.6 IteratorClose ( iterator, completion )
 
     [...]
-    6. Let innerResult be Call(return, iterator, « »).
+    5. Let innerResult be Call(return, iterator, « »).
     [...]
 features: [Symbol.iterator]
 template: async-generator
@@ -29,12 +29,12 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var thisValue = null;
+let thisValue = null;
-var args = null;
+let args = null;
-var x;
+let x;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
     // Set an upper-bound to limit unnecessary iteration in non-conformant
@@ -48,7 +48,7 @@ var iterator = {
     return {};
   }
 };
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }

src/dstr-assignment-async-iteration/array-elem-trlg-iter-list-rtrn-close-err.case

@@ -0,0 +1,60 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose is invoked when evaluation of AssignmentElementList returns
+    a "return" completion and the iterator has not been marked as "done"
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    2. Let iteratorRecord be Record {[[Iterator]]: iterator, [[Done]]: false}.
+    3. Let status be the result of performing
+       IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
+       iteratorRecord as the argument.
+    4. If status is an abrupt completion, then
+       a. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status).
+       b. Return Completion(status).
+
+    7.4.6 IteratorClose( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
+    6. If completion.[[type]] is throw, return Completion(completion).
+    7. If innerResult.[[type]] is throw, return Completion(innerResult).
+
+features: [Symbol.iterator, generators]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let returnCount = 0;
+let unreachable = 0;
+let iterator = {
+  return() {
+    returnCount += 1;
+
+    throw new Test262Error();
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+//- elems
+[ {}[yield] , ]
+//- vals
+iterable
+//- body
+unreachable += 1;
+//- teardown
+iter.return().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(returnCount, 1);
+  assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-trlg-iter-list-rtrn-close-null.case

@@ -0,0 +1,55 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose throws a TypeError when `return` returns a non-Object value
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    2. Let iteratorRecord be Record {[[Iterator]]: iterator, [[Done]]: false}.
+    3. Let status be the result of performing
+       IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
+       iteratorRecord as the argument.
+    4. If status is an abrupt completion, then
+       a. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status).
+       b. Return Completion(status).
+
+    7.4.6 IteratorClose( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
+    6. If completion.[[type]] is throw, return Completion(completion).
+    7. If innerResult.[[type]] is throw, return Completion(innerResult).
+    8. If Type(innerResult.[[value]]) is not Object, throw a TypeError
+       exception.
+
+features: [Symbol.iterator, generators]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let iterator = {
+  return() {
+    return null;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+
+//- elems
+  [ {}[yield] , ]
+//- vals
+iterable
+//- teardown
+iter.return().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, TypeError);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-trlg-iter-list-rtrn-close.case

@@ -0,0 +1,68 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose is invoked when evaluation of AssignmentElementList returns
+    a "return" completion and the iterator has not been marked as "done"
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    2. Let iteratorRecord be Record {[[Iterator]]: iterator, [[Done]]: false}.
+    3. Let status be the result of performing
+       IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
+       iteratorRecord as the argument.
+    4. If status is an abrupt completion, then
+       a. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status).
+       b. Return Completion(status).
+
+    7.4.6 IteratorClose( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
+    6. If completion.[[type]] is throw, return Completion(completion).
+    7. If innerResult.[[type]] is throw, return Completion(innerResult).
+
+features: [Symbol.iterator, generators]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let returnCount = 0;
+let unreachable = 0;
+let thisValue = null;
+let args = null;
+let iterator = {
+  return() {
+    returnCount += 1;
+    thisValue = this;
+    args = arguments;
+    return {};
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+
+//- elems
+[ {}[yield] , ]
+//- vals
+iterable
+//- body
+  unreachable += 1;
+//- teardown
+iter.return(888).then(result => {
+  assert.sameValue(returnCount, 1);
+  assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
+  assert.sameValue(result.value, 888);
+  assert(result.done, 'Iterator correctly closed');
+  assert.sameValue(thisValue, iterator, 'correct `this` value');
+  assert(!!args, 'arguments object provided');
+  assert.sameValue(args.length, 0, 'zero arguments specified');
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-trlg-iter-list-thrw-close-skip.case

@@ -0,0 +1,58 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose is not invoked when evaluation of AssignmentElementList
+    returns an abrupt completion and the iterator has been marked as "done"
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    3. Let iteratorRecord be Record {[[iterator]]: iterator, [[done]]: false}.
+    4. Let status be the result of performing
+       IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
+       iteratorRecord as the argument.
+    5. If status is an abrupt completion, then
+       a. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+          status).
+       b. Return Completion(status).
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let returnCount = 0;
+let iterable = {};
+let thrower = function() {
+  throw new Test262Error();
+};
+let iterator = {
+  next() {
+    nextCount += 1;
+    throw new Test262Error();
+  },
+  return() {
+    returnCount += 1;
+  }
+};
+iterable[Symbol.iterator] = function() {
+  return iterator;
+};
+let x;
+//- error
+Test262Error
+//- elems
+[ x , ]
+//- vals
+iterable
+//- teardown
+iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(nextCount, 1);
+  assert.sameValue(returnCount, 0);
+  assert.sameValue(iterCount, 0);
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-trlg-iter-rest-nrml-close-skip.case

@@ -0,0 +1,55 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose is not called when rest element evaluation has exhausted the
+    iterator
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    6. If AssignmentRestElement is present, then
+       a. Let status be the result of performing
+          IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
+          with iteratorRecord as the argument.
+    7. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status).
+    8. Return Completion(status).
+
+features: [Symbol.iterator]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let returnCount = 0;
+let x, y;
+let iterator = {
+  next() {
+    nextCount += 1;
+    return { value: nextCount, done: nextCount > 1 };
+  },
+  return() {
+    returnCount += 1;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+//- elems
+[ x , ...y ]
+//- vals
+iterable
+//- teardown
+iter.next().then(() => {
+  iter.return().then(() => {
+    assert.sameValue(nextCount, 2, 'nextCount');
+    assert.sameValue(returnCount, 0, 'returnCount');
+    assert.sameValue(x, 1, 'x');
+    assert.sameValue(y.length, 0, 'y.length');
+  }).then($DONE, $DONE);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-trlg-iter-rest-rtrn-close-err.case

@@ -0,0 +1,69 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose is called when AssignmentRestEvaluation produces a "return"
+    completion due to reference evaluation
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    6. If AssignmentRestElement is present, then
+       a. Let status be the result of performing
+          IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
+          with iteratorRecord as the argument.
+    7. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status).
+    8. Return Completion(status).
+
+    7.4.6 IteratorClose ( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
+    6. If completion.[[type]] is throw, return Completion(completion).
+    7. If innerResult.[[type]] is throw, return Completion(innerResult).
+
+features: [Symbol.iterator, generators]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let returnCount = 0;
+let unreachable = 0;
+let x;
+let iterator = {
+  next() {
+    nextCount += 1;
+    // Set an upper-bound to limit unnecessary iteration in non-conformant
+    // implementations
+    return { done: nextCount > 10 };
+  },
+  return() {
+    returnCount += 1;
+
+    throw new Test262Error();
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+//- elems
+[ x , ...{}[yield] ]
+//- vals
+iterable
+//- body
+  unreachable += 1;
+//- teardown
+iter.next().then(() => {
+  iter.return().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+    assert.sameValue(nextCount, 1);
+    assert.sameValue(returnCount, 1);
+    assert.sameValue(constructor, Test262Error);
+  }).then($DONE, $DONE);
+}).then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-elem-trlg-iter-rest-rtrn-close-null.case

@@ -0,0 +1,60 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: >
+    IteratorClose throws a TypeError when `return` returns a non-Object value
+info: |
+    ArrayAssignmentPattern :
+        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
+
+    [...]
+    6. If AssignmentRestElement is present, then
+       a. Let status be the result of performing
+          IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
+          with iteratorRecord as the argument.
+    7. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status).
+    8. Return Completion(status).
+
+    7.4.6 IteratorClose ( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
+    6. If completion.[[type]] is throw, return Completion(completion).
+    7. If innerResult.[[type]] is throw, return Completion(innerResult).
+
+features: [Symbol.iterator, generators]
+template: async-generator
+es6id: 12.14.5.2
+esid: sec-runtime-semantics-destructuringassignmentevaluation
+---*/
+
+//- setup
+let nextCount = 0;
+let x;
+let iterator = {
+  next() {
+    nextCount += 1;
+    // Set an upper-bound to limit unnecessary iteration in non-conformant
+    // implementations
+    return { done: nextCount > 10 };
+  },
+  return() {
+    return null;
+  }
+};
+let iterable = {
+  [Symbol.iterator]() {
+    return iterator;
+  }
+};
+
+//- elems
+[ x , ...{}[yield] ]
+//- vals
+iterable
+//- teardown
+iter.return().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
+  assert.sameValue(nextCount, 1);
+  assert.sameValue(constructor, Test262Error);
+}).then($DONE, $DONE);
+

src/dstr-assignment-async-iteration/array-elision-iter-nrml-close-skip.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: >
@@ -6,10 +6,11 @@ desc: >
 info: |
     ArrayAssignmentPattern : [ Elision ]
 
-    1. Let iterator be GetIterator(value).
+    1. Let iterator be ? GetIterator(value).
+
     [...]
-    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+
-       result).
+    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result)..
     [...]
 features: [Symbol.iterator]
 template: async-generator
@@ -17,9 +18,9 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
     return { done: true };
@@ -29,7 +30,7 @@ var iterator = {
     return {};
   }
 };
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }

src/dstr-assignment-async-iteration/array-elision-iter-nrml-close.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: >
@@ -7,16 +7,17 @@ desc: >
 info: |
     ArrayAssignmentPattern : [ Elision ]
 
-    1. Let iterator be GetIterator(value).
+    1. Let iterator be ? GetIterator(value).
-    [...]
-    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
-       result).
-    [...]
-
-    7.4.6 IteratorClose( iterator, completion )
 
     [...]
-    6. Let innerResult be Call(return, iterator, « »).
+
+    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result)..
+    [...]
+
+    7.4.6 IteratorClose ( iterator, completion )
+
+    [...]
+    5. Let innerResult be Call(return, iterator, « »).
     [...]
 features: [Symbol.iterator]
 template: async-generator
@@ -24,11 +25,11 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var thisValue = null;
+let thisValue = null;
-var args = null;
+let args = null;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
     // Set an upper-bound to limit unnecessary iteration in non-conformant
@@ -42,7 +43,7 @@ var iterator = {
     return {};
   }
 };
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }

src/dstr-assignment-async-iteration/array-elision-val-array.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: >

src/dstr-assignment-async-iteration/array-elision-val-string.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: >

src/dstr-assignment-async-iteration/array-empty-iter-close.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: Iterator is closed without iterating
@@ -9,10 +9,10 @@ info: |
     2. ReturnIfAbrupt(iterator).
     3. Return IteratorClose(iterator, NormalCompletion(empty)).
 
-    7.4.6 IteratorClose( iterator, completion )
+    7.4.6 IteratorClose ( iterator, completion )
 
     [...]
-    6. Let innerResult be Call(return, iterator, « »).
+    5. Let innerResult be Call(return, iterator, « »).
     [...]
 features: [Symbol.iterator]
 template: async-generator
@@ -20,11 +20,11 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var thisValue = null;
+let thisValue = null;
-var args = null;
+let args = null;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
     return { done: true };
@@ -36,7 +36,7 @@ var iterator = {
     return {};
   }
 };
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }

src/dstr-assignment-async-iteration/array-empty-val-array.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---

src/dstr-assignment-async-iteration/array-empty-val-string.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---

src/dstr-assignment-async-iteration/array-rest-after-element.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -10,7 +10,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x, y;
+let x, y;
 //- elems
 [x, ...y]
 //- vals

src/dstr-assignment-async-iteration/array-rest-after-elision.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -9,7 +9,7 @@ template: default
 ---*/
 
 //- setup
-var x;
+let x;
 //- elems
 [, ...x]
 //- vals

src/dstr-assignment-async-iteration/array-rest-elision.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -9,7 +9,7 @@ template: default
 ---*/
 
 //- setup
-var x, y;
+let x, y;
 //- elems
 [, , x, , ...y]
 //- vals

src/dstr-assignment-async-iteration/array-rest-iter-nrml-close-skip.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: >
@@ -8,22 +8,21 @@ info: |
     ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
 
     [...]
-    5. Let result be the result of performing
+    4. Let result be the result of performing
-       IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with
+      IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
-       iteratorRecord as the argument
+      with iteratorRecord as the argument.
-    6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+    5. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
-       result).
+    6. Return result.
-    7. Return result.
 features: [Symbol.iterator]
 template: async-generator
 esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var x;
+let x;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
     return { done: true };
@@ -32,7 +31,7 @@ var iterator = {
     returnCount += 1;
   }
 };
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }
@@ -45,10 +44,7 @@ iterable
 assert.sameValue(nextCount, 1);
 assert.sameValue(returnCount, 0);
 
-
+//- teardown
-iter.next().then(() => {
+iter.next()
-  assert.throws(Test262Error, () => iter.return());
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
-  assert.sameValue(returnCount, 1);
+  .then($DONE, $DONE);
-  assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
-})
-

src/dstr-assignment-async-iteration/array-rest-iter-rtrn-close-err.case

@@ -1,65 +0,0 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-/*---
-desc: >
-    IteratorClose is called when reference evaluation produces a "return"
-    completion
-info: |
-    ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
-
-    [...]
-    5. Let result be the result of performing
-       IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with
-       iteratorRecord as the argument
-    6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
-       result).
-
-    AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
-
-    1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
-       ArrayLiteral, then
-       a. Let lref be the result of evaluating DestructuringAssignmentTarget.
-       b. ReturnIfAbrupt(lref).
-
-    7.4.6 IteratorClose( iterator, completion )
-
-    [...]
-    6. Let innerResult be Call(return, iterator, « »).
-    7. If completion.[[type]] is throw, return Completion(completion).
-    8. If innerResult.[[type]] is throw, return Completion(innerResult).
-features: [Symbol.iterator, generators]
-template: async-generator
-esid: sec-runtime-semantics-destructuringassignmentevaluation
----*/
-
-//- setup
-function ReturnError() {}
-var returnCount = 0;
-var unreachable = 0;
-var iterator = {
-  return() {
-    returnCount += 1;
-
-    throw new Test262Error();
-  }
-};
-var iterable = {
-  [Symbol.iterator]() {
-    return iterator;
-  }
-};
-
-//- elems
-[...{}[yield]]
-//- vals
-iterable
-//- body
-unreachable += 1;
-//- teardown
-
-iter.next().then(() => {
-  assert.throws(Test262Error, () => iter.return());
-  assert.sameValue(returnCount, 1);
-  assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
-}).then($DONE, $DONE);
-

src/dstr-assignment-async-iteration/array-rest-iter-rtrn-close-null.case

@@ -1,66 +0,0 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-/*---
-desc: >
-    IteratorClose throws a TypeError when `return` returns a non-Object value
-info: |
-    ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
-
-    [...]
-    5. Let result be the result of performing
-       IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with
-       iteratorRecord as the argument
-    6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
-       result).
-
-    AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
-
-    1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
-       ArrayLiteral, then
-       a. Let lref be the result of evaluating DestructuringAssignmentTarget.
-       b. ReturnIfAbrupt(lref).
-
-    7.4.6 IteratorClose( iterator, completion )
-
-    [...]
-    6. Let innerResult be Call(return, iterator, « »).
-    [...]
-
-    7.4.6 IteratorClose( iterator, completion )
-
-    [...]
-    6. Let innerResult be Call(return, iterator, « »).
-    7. If completion.[[type]] is throw, return Completion(completion).
-    8. If innerResult.[[type]] is throw, return Completion(innerResult).
-features: [Symbol.iterator, generators]
-template: async-generator
-esid: sec-runtime-semantics-destructuringassignmentevaluation
----*/
-
-//- setup
-var iterable = {};
-var iterator = {
-  return() {
-    return null;
-  }
-};
-var iterable = {
-  [Symbol.iterator]() {
-    return iterator;
-  }
-};
-
-
-//- elems
-[...{}[yield]]
-//- vals
-iterable
-//- teardown
-
-
-iter.next().then(() => {
-  assert.throws(Test262Error, () => iter.return());
-  assert.sameValue(returnCount, 1);
-  assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
-}).then($DONE, $DONE);
-

src/dstr-assignment-async-iteration/array-rest-iter-rtrn-close.case

@@ -1,83 +0,0 @@
-// Copyright (C) 2017 the V8 project authors. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-/*---
-desc: >
-    IteratorClose is called when reference evaluation produces a "return"
-    completion
-info: |
-    ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
-
-    [...]
-    5. Let result be the result of performing
-       IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with
-       iteratorRecord as the argument
-    6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
-       result).
-
-    AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
-
-    1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
-       ArrayLiteral, then
-       a. Let lref be the result of evaluating DestructuringAssignmentTarget.
-       b. ReturnIfAbrupt(lref).
-
-    7.4.6 IteratorClose( iterator, completion )
-
-    [...]
-    6. Let innerResult be Call(return, iterator, « »).
-    [...]
-
-    7.4.6 IteratorClose( iterator, completion )
-
-    [...]
-    6. Let innerResult be Call(return, iterator, « »).
-    7. If completion.[[type]] is throw, return Completion(completion).
-    8. If innerResult.[[type]] is throw, return Completion(innerResult).
-features: [Symbol.iterator, generators]
-template: async-generator
-esid: sec-runtime-semantics-destructuringassignmentevaluation
----*/
-
-//- setup
-var returnCount = 0;
-var unreachable = 0;
-var thisValue = null;
-var args = null;
-var iterator = {
-  return() {
-    returnCount += 1;
-    thisValue = this;
-    args = arguments;
-    return {};
-  }
-};
-var iterable = {
-  [Symbol.iterator]() {
-    return iterator;
-  }
-};
-
-//- elems
-[...{}[yield]]
-//- vals
-iterable
-//- body
-unreachable += 1;
-//- teardown
-
-
-iter.next().then(() => {
-  iter.return(444).then(result => {
-    assert.sameValue(returnCount, 1);
-    assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
-    assert.sameValue(result.value, 444);
-    assert(result.done, 'Iterator correctly closed');
-    assert.sameValue(thisValue, iterator, 'correct `this` value');
-    assert(!!args, 'arguments object provided');
-    assert.sameValue(args.length, 0, 'zero arguments specified');
-  }).then($DONE, $DONE);
-});
-
-
-
-

src/dstr-assignment-async-iteration/array-rest-iteration.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,15 +11,15 @@ features: [generators]
 ---*/
 
 //- setup
-var count = 0;
+let count = 0;
-var g = function*() {
+let g = function*() {
   count += 1;
   yield;
   count += 1;
   yield;
   count += 1;
 }
-var x;
+let x;
 //- elems
 [...x]
 //- vals
@@ -27,4 +27,9 @@ g()
 //- body
 assert.sameValue(count, 3);
 
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
+
 

src/dstr-assignment-async-iteration/array-rest-lref.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 desc: Reference is evaluated during assignment
@@ -6,11 +6,11 @@ info: |
     ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
 
     [...]
-    5. Let result be the result of performing
+    4. Let result be the result of performing
-       IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with
+      IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
-       iteratorRecord as the argument
+      with iteratorRecord as the argument.
-    6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
+    5. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
-       result).
+
 
     AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
 
@@ -25,9 +25,9 @@ esid: sec-runtime-semantics-destructuringassignmentevaluation
 ---*/
 
 //- setup
-var nextCount = 0;
+let nextCount = 0;
-var returnCount = 0;
+let returnCount = 0;
-var iterator = {
+let iterator = {
   next() {
     nextCount += 1;
     return { done: true };
@@ -36,8 +36,8 @@ var iterator = {
     returnCount += 1;
   }
 };
-var obj = {};
+let obj = {};
-var iterable = {
+let iterable = {
   [Symbol.iterator]() {
     return iterator;
   }
@@ -52,4 +52,8 @@ assert.sameValue(returnCount, 0);
 assert(!!obj.ab);
 assert.sameValue(obj.ab.length, 0);
 
+//- teardown
+iter.next()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
 

src/dstr-assignment-async-iteration/array-rest-nested-array-null.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -10,7 +10,7 @@ template: default
 ---*/
 
 //- setup
-var x, y;
+let x, y;
 //- elems
 [...[x, y]]
 //- vals

src/dstr-assignment-async-iteration/array-rest-nested-array-undefined-hole.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,7 +11,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x = null;
+let x = null;
 //- elems
 [...[x]]
 //- vals

src/dstr-assignment-async-iteration/array-rest-nested-array-undefined-own.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,7 +11,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x = null;
+let x = null;
 //- elems
 [...[x]]
 //- vals

src/dstr-assignment-async-iteration/array-rest-nested-array-undefined.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,7 +11,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x = null;
+let x = null;
 //- elems
 [...[x]]
 //- vals

src/dstr-assignment-async-iteration/array-rest-nested-array-yield-expr.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,8 +11,7 @@ features: [generators]
 ---*/
 
 //- setup
-var value = [86];
+let x = {};
-var x = {};
 
 //- elems
 [...[x[yield]]]
@@ -24,9 +23,7 @@ iter.next().then(iterationResult => {
   assert.sameValue(iterationResult.done, false);
   assert.sameValue(x.prop, undefined);
 
-  // TODO add iterCount
+  iter.next('prop').then(iterationResult => {
-  //
-  iter.next(86).then(iterationResult => {
     assert.sameValue(iterationResult.value, undefined);
     assert.sameValue(iterationResult.done, true);
     assert.sameValue(x.prop, 86);

src/dstr-assignment-async-iteration/array-rest-nested-array-yield-ident-valid.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -6,13 +6,13 @@ desc: >
     When a `yield` token appears within the DestructuringAssignmentTarget of a
     nested destructuring assignment and outside of a generator function body,
     it should behave as an IdentifierExpression.
-template: default
+template: async-function
 flags: [noStrict]
 ---*/
 
 //- setup
-var yield = 'prop';
+let yield = 'prop';
-var x = {};
+let x = {};
 //- elems
 [...[x[yield]]]
 //- vals

src/dstr-assignment-async-iteration/array-rest-nested-array.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,7 +11,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x;
+let x;
 //- elems
 [...[x]]
 //- vals

src/dstr-assignment-async-iteration/array-rest-nested-obj-null.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,7 +11,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x, length;
+let x, length;
 //- elems
 [...{ 0: x, length }]
 //- vals

src/dstr-assignment-async-iteration/array-rest-nested-obj-undefined-hole.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,7 +11,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x = null;
+let x = null;
 // Use the the top-level lexical scope for 'length' to provide compatibility with browsers
 // where length and name are properties of WindowProxy
 let length;
@@ -22,3 +22,8 @@ let length;
 //- body
 assert.sameValue(x, undefined);
 assert.sameValue(length, 1);
+
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-rest-nested-obj-undefined-own.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,7 +11,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x = null;
+let x = null;
 // Use the the top-level lexical scope for 'length' to provide compatibility with browsers
 // where length and name are properties of WindowProxy
 let length;
@@ -22,3 +22,8 @@ let length;
 //- body
 assert.sameValue(x, undefined);
 assert.sameValue(length, 1);
+
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-rest-nested-obj-undefined.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -11,7 +11,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x = null;
+let x = null;
 // Use the the top-level lexical scope for 'length' to provide compatibility with browsers
 // where length and name are properties of WindowProxy
 let length;
@@ -22,3 +22,8 @@ let length;
 //- body
 assert.sameValue(x, undefined);
 assert.sameValue(length, 0);
+
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-rest-nested-obj-yield-expr.case

@@ -11,7 +11,7 @@ features: [generators]
 ---*/
 
 //- setup
-var x;
+let x;
 
 //- elems
 [...{ x = yield }]
@@ -23,8 +23,6 @@ iter.next().then(iterationResult => {
   assert.sameValue(iterationResult.done, false);
   assert.sameValue(x, undefined);
 
-  // TODO add iterCount
-  //
   iter.next(4).then(iterationResult => {
     assert.sameValue(iterationResult.value, undefined);
     assert.sameValue(iterationResult.done, true);

src/dstr-assignment-async-iteration/array-rest-nested-obj-yield-ident-valid.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -6,16 +6,21 @@ desc: >
     When a `yield` token appears within the Initializer of a nested
     destructuring assignment and outside of a generator function body, it
     should behave as an IdentifierExpression.
-template: default
+template: async-function
 flags: [noStrict]
 ---*/
 
 //- setup
-var yield = 2;
+let yield = 2;
-var x;
+let x;
 //- elems
 [...{ x = yield }]
 //- vals
 [{}]
 //- body
 assert.sameValue(x, 2);
+
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-rest-nested-obj.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -10,10 +10,14 @@ template: default
 ---*/
 
 //- setup
-var x;
+let x;
 //- elems
 [...{ 1: x }]
 //- vals
 [1, 2, 3]
 //- body
 assert.sameValue(x, 2);
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-rest-put-prop-ref-no-get.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -10,8 +10,8 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var setValue;
+let setValue;
-var x = {
+let x = {
   get y() {
     $ERROR('The property should not be accessed.');
   },
@@ -28,3 +28,7 @@ assert.sameValue(setValue.length, 3);
 assert.sameValue(setValue[0], 23);
 assert.sameValue(setValue[1], 45);
 assert.sameValue(setValue[2], 99);
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);

src/dstr-assignment-async-iteration/array-rest-put-prop-ref.case

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -10,7 +10,7 @@ es6id: 12.14.5.3
 ---*/
 
 //- setup
-var x = {};
+let x = {};
 //- elems
 [...x.y]
 //- vals
@@ -20,3 +20,7 @@ assert.sameValue(x.y.length, 3);
 assert.sameValue(x.y[0], 4);
 assert.sameValue(x.y[1], 3);
 assert.sameValue(x.y[2], 2);
+//- teardown
+promise
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);