src/dstr-binding-async-iteration => src/dstr-binding-for-await

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

119 files changed, 3966 insertions, 0 deletions

diff --git a/src/dstr-binding-for-await/ary-init-iter-close.case b/src/dstr-binding-for-await/ary-init-iter-close.case
new file mode 100644
index 000000000..860a773bf
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-init-iter-close.case
@@ -0,0 +1,37 @@
+// 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 when not exhausted by pattern evaluation
+template: default
+info: |
+    13.3.3.5 Runtime Semantics: BindingInitialization
+
+    BindingPattern : ArrayBindingPattern
+
+    [...]
+    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
+       result).
+    [...]
+features: [Symbol.iterator]
+---*/
+
+//- setup
+var doneCallCount = 0;
+var iter = {};
+iter[Symbol.iterator] = function() {
+  return {
+    next() {
+      return { value: null, done: false };
+    },
+    return() {
+      doneCallCount += 1;
+      return {};
+    }
+  };
+};
+//- elems
+[x]
+//- vals
+iter
+//- body
+assert.sameValue(doneCallCount, 1);
diff --git a/src/dstr-binding-for-await/ary-init-iter-get-err.case b/src/dstr-binding-for-await/ary-init-iter-get-err.case
new file mode 100644
index 000000000..1ac51278b
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-init-iter-get-err.case
@@ -0,0 +1,25 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Abrupt completion returned by GetIterator
+template: error
+info: |
+    13.3.3.5 Runtime Semantics: BindingInitialization
+
+    BindingPattern : ArrayBindingPattern
+
+    1. Let iterator be ? GetIterator(value).
+features: [Symbol.iterator]
+---*/
+
+//- setup
+var iter = {};
+iter[Symbol.iterator] = function() {
+  throw new Test262Error();
+};
+//- elems
+[x]
+//- vals
+iter
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/ary-init-iter-no-close.case b/src/dstr-binding-for-await/ary-init-iter-no-close.case
new file mode 100644
index 000000000..8184d2f2e
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-init-iter-no-close.case
@@ -0,0 +1,37 @@
+// 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 not closed when exhausted by pattern evaluation
+template: default
+info: |
+    13.3.3.5 Runtime Semantics: BindingInitialization
+
+    BindingPattern : ArrayBindingPattern
+
+    [...]
+    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
+       result).
+    [...]
+features: [Symbol.iterator]
+---*/
+
+//- setup
+var doneCallCount = 0;
+var iter = {};
+iter[Symbol.iterator] = function() {
+  return {
+    next() {
+      return { value: null, done: true };
+    },
+    return() {
+      doneCallCount += 1;
+      return {};
+    }
+  };
+};
+//- elems
+[x]
+//- vals
+iter
+//- body
+assert.sameValue(doneCallCount, 0);
diff --git a/src/dstr-binding-for-await/ary-name-iter-val.case b/src/dstr-binding-for-await/ary-name-iter-val.case
new file mode 100644
index 000000000..624994f47
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-name-iter-val.case
@@ -0,0 +1,34 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: SingleNameBinding with normal value iteration
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    3. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+       d. If next is false, set iteratorRecord.[[done]] to true.
+       e. Else,
+          i. Let v be IteratorValue(next).
+          ii. If v is an abrupt completion, set
+              iteratorRecord.[[done]] to true.
+          iii. ReturnIfAbrupt(v).
+    4. If iteratorRecord.[[done]] is true, let v be undefined.
+    [...]
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[x, y, z]
+//- vals
+[1, 2, 3]
+//- body
+assert.sameValue(x, 1);
+assert.sameValue(y, 2);
+assert.sameValue(z, 3);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-elem-init.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-elem-init.case
new file mode 100644
index 000000000..ae00dace2
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-elem-init.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: BindingElement with array binding pattern and initializer is used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    2. If iteratorRecord.[[done]] is true, let v be undefined.
+    3. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- elems
+[[x, y, z] = [4, 5, 6]]
+//- vals
+[]
+//- body
+assert.sameValue(x, 4);
+assert.sameValue(y, 5);
+assert.sameValue(z, 6);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-elem-iter.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-elem-iter.case
new file mode 100644
index 000000000..cb561cf1b
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-elem-iter.case
@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: BindingElement with array binding pattern and initializer is not used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    1. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       [...]
+       e. Else,
+          i. Let v be IteratorValue(next).
+          [...]
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- elems
+[[x, y, z] = [4, 5, 6]]
+//- vals
+[[7, 8, 9]]
+//- body
+assert.sameValue(x, 7);
+assert.sameValue(y, 8);
+assert.sameValue(z, 9);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-elision-init.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-elision-init.case
new file mode 100644
index 000000000..e09a765c7
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-elision-init.case
@@ -0,0 +1,35 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: BindingElement with array binding pattern and initializer is used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    2. If iteratorRecord.[[done]] is true, let v be undefined.
+    3. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+features: [generators]
+---*/
+
+//- setup
+var first = 0;
+var second = 0;
+function* g() {
+  first += 1;
+  yield;
+  second += 1;
+};
+//- elems
+[[,] = g()]
+//- vals
+[]
+//- body
+assert.sameValue(first, 1);
+assert.sameValue(second, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-elision-iter.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-elision-iter.case
new file mode 100644
index 000000000..96f07a6d1
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-elision-iter.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: BindingElement with array binding pattern and initializer is not used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    1. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       [...]
+       e. Else,
+          i. Let v be IteratorValue(next).
+          [...]
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+features: [generators]
+---*/
+
+//- setup
+var callCount = 0;
+function* g() {
+  callCount += 1;
+};
+//- elems
+[[,] = g()]
+//- vals
+[[]]
+//- body
+assert.sameValue(callCount, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-empty-init.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-empty-init.case
new file mode 100644
index 000000000..fcec666f2
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-empty-init.case
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: BindingElement with array binding pattern and initializer is used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    2. If iteratorRecord.[[done]] is true, let v be undefined.
+    3. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- setup
+var initCount = 0;
+var iterCount = 0;
+var iter = function*() { iterCount += 1; }();
+//- elems
+[[] = function() { initCount += 1; return iter; }()]
+//- vals
+[]
+//- body
+assert.sameValue(initCount, 1);
+assert.sameValue(iterCount, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-empty-iter.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-empty-iter.case
new file mode 100644
index 000000000..c88783d15
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-empty-iter.case
@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: BindingElement with array binding pattern and initializer is not used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    1. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       [...]
+       e. Else,
+          i. Let v be IteratorValue(next).
+          [...]
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- setup
+var initCount = 0;
+//- elems
+[[] = function() { initCount += 1; }()]
+//- vals
+[[23]]
+//- body
+assert.sameValue(initCount, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-rest-init.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-rest-init.case
new file mode 100644
index 000000000..59f46ff49
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-rest-init.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: BindingElement with array binding pattern and initializer is used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    2. If iteratorRecord.[[done]] is true, let v be undefined.
+    3. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- setup
+var values = [2, 1, 3];
+//- elems
+[[...x] = values]
+//- vals
+[]
+//- body
+assert(Array.isArray(x));
+assert.sameValue(x[0], 2);
+assert.sameValue(x[1], 1);
+assert.sameValue(x[2], 3);
+assert.sameValue(x.length, 3);
+assert.notSameValue(x, values);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-rest-iter.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-rest-iter.case
new file mode 100644
index 000000000..b7269eac1
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-rest-iter.case
@@ -0,0 +1,35 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: BindingElement with array binding pattern and initializer is not used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    1. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       [...]
+       e. Else,
+          i. Let v be IteratorValue(next).
+          [...]
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- setup
+var values = [2, 1, 3];
+var initCount = 0;
+//- elems
+[[...x] = function() { initCount += 1; }()]
+//- vals
+[values]
+//- body
+assert(Array.isArray(x));
+assert.sameValue(x[0], 2);
+assert.sameValue(x[1], 1);
+assert.sameValue(x[2], 3);
+assert.sameValue(x.length, 3);
+assert.notSameValue(x, values);
+assert.sameValue(initCount, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-ary-val-null.case b/src/dstr-binding-for-await/ary-ptrn-elem-ary-val-null.case
new file mode 100644
index 000000000..633f880f9
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-ary-val-null.case
@@ -0,0 +1,31 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Nested array destructuring with a null value
+template: error
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    1. If iteratorRecord.[[done]] is false, then
+       [...]
+       e. Else
+          i. Let v be IteratorValue(next).
+          [...]
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+
+    13.3.3.5 Runtime Semantics: BindingInitialization
+
+    BindingPattern : ArrayBindingPattern
+
+    1. Let iterator be ? GetIterator(value).
+---*/
+
+//- elems
+[[x]]
+//- vals
+[null]
+//- error
+TypeError
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-exhausted.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-exhausted.case
new file mode 100644
index 000000000..df82792fe
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-exhausted.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: Destructuring initializer with an exhausted iterator
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    4. If iteratorRecord.[[done]] is true, let v be undefined.
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be GetValue(defaultValue).
+       [...]
+    6. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[x = 23]
+//- vals
+[]
+//- body
+assert.sameValue(x, 23);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-arrow.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-arrow.case
new file mode 100644
index 000000000..23001a4dd
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-arrow.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: SingleNameBinding does assign name to arrow functions
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+       c. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          [...]
+    6. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[arrow = () => {}]
+//- vals
+[]
+//- body
+assert.sameValue(arrow.name, 'arrow');
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-class.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-class.case
new file mode 100644
index 000000000..4185a236b
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-class.case
@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: SingleNameBinding assigns `name` to "anonymous" classes
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+       c. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          [...]
+    6. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[cls = class {}, xCls = class X {}, xCls2 = class { static name() {} }]
+//- vals
+[]
+//- body
+assert.sameValue(cls.name, 'cls');
+assert.notSameValue(xCls.name, 'xCls');
+assert.notSameValue(xCls2.name, 'xCls2');
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-cover.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-cover.case
new file mode 100644
index 000000000..e466b2b04
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-cover.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: SingleNameBinding does assign name to "anonymous" functions "through" cover grammar
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+       c. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          [...]
+    6. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[cover = (function () {}), xCover = (0, function() {})]
+//- vals
+[]
+//- body
+assert.sameValue(cover.name, 'cover');
+assert.notSameValue(xCover.name, 'xCover');
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-fn.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-fn.case
new file mode 100644
index 000000000..e537c02c8
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-fn.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: SingleNameBinding assigns name to "anonymous" functions
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+       c. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          [...]
+    6. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[fn = function () {}, xFn = function x() {}]
+//- vals
+[]
+//- body
+assert.sameValue(fn.name, 'fn');
+assert.notSameValue(xFn.name, 'xFn');
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-gen.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-gen.case
new file mode 100644
index 000000000..5b1736e88
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-gen.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: SingleNameBinding assigns name to "anonymous" generator functions
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+       c. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          [...]
+    6. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[gen = function* () {}, xGen = function* x() {}]
+//- vals
+[]
+//- body
+assert.sameValue(gen.name, 'gen');
+assert.notSameValue(xGen.name, 'xGen');
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-hole.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-hole.case
new file mode 100644
index 000000000..a234fffd8
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-hole.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: Destructuring initializer with a "hole"
+template: default
+info: >
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be GetValue(defaultValue).
+       [...]
+    6. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[x = 23]
+//- vals
+[,]
+//- body
+assert.sameValue(x, 23);
+// another statement
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-skipped.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-skipped.case
new file mode 100644
index 000000000..84cf03cf4
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-skipped.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: Destructuring initializer is not evaluated when value is not `undefined`
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    6. If Initializer is present and v is undefined, then
+       [...]
+    7. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- setup
+var initCount = 0;
+function counter() {
+  initCount += 1;
+}
+//- elems
+[w = counter(), x = counter(), y = counter(), z = counter()]
+//- vals
+[null, 0, false, '']
+//- body
+assert.sameValue(w, null);
+assert.sameValue(x, 0);
+assert.sameValue(y, false);
+assert.sameValue(z, '');
+assert.sameValue(initCount, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-throws.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-throws.case
new file mode 100644
index 000000000..f4eb856aa
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-throws.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: Destructuring initializer returns an abrupt completion
+template: error
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+---*/
+
+//- elems
+[x = (function() { throw new Test262Error(); })()]
+//- vals
+[undefined]
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-undef.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-undef.case
new file mode 100644
index 000000000..3cbf54138
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-undef.case
@@ -0,0 +1,25 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Destructuring initializer with an undefined value
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be GetValue(defaultValue).
+       [...]
+    6. If environment is undefined, return PutValue(lhs, v).
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[x = 23]
+//- vals
+[undefined]
+//- body
+assert.sameValue(x, 23);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-init-unresolvable.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-unresolvable.case
new file mode 100644
index 000000000..9dc9bf8f4
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-init-unresolvable.case
@@ -0,0 +1,29 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Destructuring initializer is an unresolvable reference
+template: error
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+
+    6.2.4.1 GetValue ( V )
+
+    1. ReturnIfAbrupt(V).
+    2. If Type(V) is not Reference, return V.
+    3. Let base be GetBase(V).
+    4. If IsUnresolvableReference(V), throw a ReferenceError exception.
+---*/
+
+//- elems
+[ x = unresolvableReference ]
+//- vals
+[]
+//- error
+ReferenceError
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-complete.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-complete.case
new file mode 100644
index 000000000..de40bed9e
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-complete.case
@@ -0,0 +1,29 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: SingleNameBinding when value iteration completes
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    3. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+       d. If next is false, set iteratorRecord.[[done]] to true.
+       e. Else,
+          [...]
+    4. If iteratorRecord.[[done]] is true, let v be undefined.
+    [...]
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[x]
+//- vals
+[]
+//- body
+assert.sameValue(x, undefined);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-done.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-done.case
new file mode 100644
index 000000000..e21fb9eaf
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-done.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: SingleNameBinding when value iteration was completed previously
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    3. If iteratorRecord.[[done]] is false, then
+       [...]
+    4. If iteratorRecord.[[done]] is true, let v be undefined.
+    [...]
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[_, x]
+//- vals
+[]
+//- body
+assert.sameValue(x, undefined);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-step-err.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-step-err.case
new file mode 100644
index 000000000..34faa9e14
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-step-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: Error forwarding when IteratorStep returns an abrupt completion
+template: error
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    3. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+---*/
+
+//- setup
+var g = {};
+g[Symbol.iterator] = function() {
+  return {
+    next() {
+      throw new Test262Error();
+    }
+  };
+};
+//- elems
+[x]
+//- vals
+g
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-val-err.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-val-err.case
new file mode 100644
index 000000000..d87224a32
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-val-err.case
@@ -0,0 +1,43 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Error forwarding when IteratorValue returns an abrupt completion
+template: error
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    3. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+       d. If next is false, set iteratorRecord.[[done]] to true.
+       e. Else,
+          i. Let v be IteratorValue(next).
+          ii. If v is an abrupt completion, set iteratorRecord.[[done]] to
+              true.
+          iii. ReturnIfAbrupt(v).
+---*/
+
+//- setup
+var poisonedValue = Object.defineProperty({}, 'value', {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+var g = {};
+g[Symbol.iterator] = function() {
+  return {
+    next() {
+      return poisonedValue;
+    }
+  };
+};
+//- elems
+[x]
+//- vals
+g
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-val.case b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-val.case
new file mode 100644
index 000000000..364ffa6fb
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-id-iter-val.case
@@ -0,0 +1,34 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: SingleNameBinding when value iteration was completed previously
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    3. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+       d. If next is false, set iteratorRecord.[[done]] to true.
+       e. Else,
+          i. Let v be IteratorValue(next).
+          ii. If v is an abrupt completion, set
+              iteratorRecord.[[done]] to true.
+          iii. ReturnIfAbrupt(v).
+    4. If iteratorRecord.[[done]] is true, let v be undefined.
+    [...]
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[x, y, z]
+//- vals
+[1, 2, 3]
+//- body
+assert.sameValue(x, 1);
+assert.sameValue(y, 2);
+assert.sameValue(z, 3);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-obj-id-init.case b/src/dstr-binding-for-await/ary-ptrn-elem-obj-id-init.case
new file mode 100644
index 000000000..b3be0967b
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-obj-id-init.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: BindingElement with object binding pattern and initializer is used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    2. If iteratorRecord.[[done]] is true, let v be undefined.
+    3. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- elems
+[{ x, y, z } = { x: 44, y: 55, z: 66 }]
+//- vals
+[]
+//- body
+assert.sameValue(x, 44);
+assert.sameValue(y, 55);
+assert.sameValue(z, 66);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-obj-id.case b/src/dstr-binding-for-await/ary-ptrn-elem-obj-id.case
new file mode 100644
index 000000000..d6ca94ed3
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-obj-id.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: BindingElement with object binding pattern and initializer is not used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    2. If iteratorRecord.[[done]] is true, let v be undefined.
+    3. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- elems
+[{ x, y, z } = { x: 44, y: 55, z: 66 }]
+//- vals
+[{ x: 11, y: 22, z: 33 }]
+//- body
+assert.sameValue(x, 11);
+assert.sameValue(y, 22);
+assert.sameValue(z, 33);
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-obj-prop-id-init.case b/src/dstr-binding-for-await/ary-ptrn-elem-obj-prop-id-init.case
new file mode 100644
index 000000000..10887bd28
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-obj-prop-id-init.case
@@ -0,0 +1,37 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: BindingElement with object binding pattern and initializer is used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    2. If iteratorRecord.[[done]] is true, let v be undefined.
+    3. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- elems
+[{ u: v, w: x, y: z } = { u: 444, w: 555, y: 666 }]
+//- vals
+[]
+//- body
+assert.sameValue(v, 444);
+assert.sameValue(x, 555);
+assert.sameValue(z, 666);
+
+assert.throws(ReferenceError, function() {
+  u;
+});
+assert.throws(ReferenceError, function() {
+  w;
+});
+assert.throws(ReferenceError, function() {
+  y;
+});
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-obj-prop-id.case b/src/dstr-binding-for-await/ary-ptrn-elem-obj-prop-id.case
new file mode 100644
index 000000000..2c5bd0cbe
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-obj-prop-id.case
@@ -0,0 +1,37 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: BindingElement with object binding pattern and initializer is not used
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    2. If iteratorRecord.[[done]] is true, let v be undefined.
+    3. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Let v be ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+---*/
+
+//- elems
+[{ u: v, w: x, y: z } = { u: 444, w: 555, y: 666 }]
+//- vals
+[{ u: 777, w: 888, y: 999 }]
+//- body
+assert.sameValue(v, 777);
+assert.sameValue(x, 888);
+assert.sameValue(z, 999);
+
+assert.throws(ReferenceError, function() {
+  u;
+});
+assert.throws(ReferenceError, function() {
+  w;
+});
+assert.throws(ReferenceError, function() {
+  y;
+});
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-obj-val-null.case b/src/dstr-binding-for-await/ary-ptrn-elem-obj-val-null.case
new file mode 100644
index 000000000..bcdf94c98
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-obj-val-null.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: Nested object destructuring with a null value
+template: error
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    1. If iteratorRecord.[[done]] is false, then
+       [...]
+       e. Else
+          i. Let v be IteratorValue(next).
+          [...]
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+
+    13.3.3.5 Runtime Semantics: BindingInitialization
+
+    BindingPattern : ObjectBindingPattern
+
+    1. Let valid be RequireObjectCoercible(value).
+    2. ReturnIfAbrupt(valid).
+---*/
+
+//- elems
+[{ x }]
+//- vals
+[null]
+//- error
+TypeError
diff --git a/src/dstr-binding-for-await/ary-ptrn-elem-obj-val-undef.case b/src/dstr-binding-for-await/ary-ptrn-elem-obj-val-undef.case
new file mode 100644
index 000000000..f3603bc0a
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elem-obj-val-undef.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: Nested object destructuring with a value of `undefined`
+template: error
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    1. If iteratorRecord.[[done]] is false, then
+       [...]
+       e. Else
+          i. Let v be IteratorValue(next).
+          [...]
+    4. Return the result of performing BindingInitialization of BindingPattern
+       with v and environment as the arguments.
+
+    13.3.3.5 Runtime Semantics: BindingInitialization
+
+    BindingPattern : ObjectBindingPattern
+
+    1. Let valid be RequireObjectCoercible(value).
+    2. ReturnIfAbrupt(valid).
+---*/
+
+//- elems
+[{ x }]
+//- vals
+[]
+//- error
+TypeError
diff --git a/src/dstr-binding-for-await/ary-ptrn-elision-exhausted.case b/src/dstr-binding-for-await/ary-ptrn-elision-exhausted.case
new file mode 100644
index 000000000..2d7cd5094
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elision-exhausted.case
@@ -0,0 +1,31 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Elision accepts exhausted iterator
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    ArrayBindingPattern : [ Elision ]
+
+    1. Return the result of performing
+       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
+       as the argument.
+
+    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
+
+    Elision : ,
+
+    1. If iteratorRecord.[[done]] is false, then
+       [...]
+    2. Return NormalCompletion(empty).
+features: [generator]
+---*/
+
+//- setup
+var iter = function*() {}();
+iter.next();
+//- elems
+[,]
+//- vals
+iter
diff --git a/src/dstr-binding-for-await/ary-ptrn-elision-iter-close.case b/src/dstr-binding-for-await/ary-ptrn-elision-iter-close.case
new file mode 100644
index 000000000..18c0046a3
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elision-iter-close.case
@@ -0,0 +1,21 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: iter-close
+desc: >
+  The iterator is properly consumed by the destructuring pattern
+---*/
+
+//- setup
+const iter = (function* () {
+  yield;
+  yield;
+})();
+
+//- elems
+[,]
+//- iter
+iter
+//- assertions
+assert.sameValue(iter.next().done, true, 'iteration occurred as expected');
diff --git a/src/dstr-binding-for-await/ary-ptrn-elision-step-err.case b/src/dstr-binding-for-await/ary-ptrn-elision-step-err.case
new file mode 100644
index 000000000..1f1d69448
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elision-step-err.case
@@ -0,0 +1,39 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Elision advances iterator and forwards abrupt completions
+template: error
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    ArrayBindingPattern : [ Elision ]
+
+    1. Return the result of performing
+       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
+       as the argument.
+
+    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
+
+    Elision : ,
+
+    1. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+features: [generator]
+---*/
+
+//- setup
+var following = 0;
+var iter = function* () {
+  throw new Test262Error();
+  following += 1;
+}();
+//- elems
+[,]
+//- vals
+iter
+//- error
+Test262Error
+//- rejectBody
+assert.sameValue(following, 0, "iterator is properly closed");
diff --git a/src/dstr-binding-for-await/ary-ptrn-elision.case b/src/dstr-binding-for-await/ary-ptrn-elision.case
new file mode 100644
index 000000000..828e8413a
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-elision.case
@@ -0,0 +1,42 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Elision advances iterator
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    ArrayBindingPattern : [ Elision ]
+
+    1. Return the result of performing
+       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
+       as the argument.
+
+    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
+
+    Elision : ,
+
+    1. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+       d. If next is false, set iteratorRecord.[[done]] to true.
+    2. Return NormalCompletion(empty).
+features: [generator]
+---*/
+
+//- setup
+var first = 0;
+var second = 0;
+function* g() {
+  first += 1;
+  yield;
+  second += 1;
+};
+//- elems
+[,]
+//- vals
+g()
+//- body
+assert.sameValue(first, 1);
+assert.sameValue(second, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-empty.case b/src/dstr-binding-for-await/ary-ptrn-empty.case
new file mode 100644
index 000000000..6a348ea18
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-empty.case
@@ -0,0 +1,25 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: No iteration occurs for an "empty" array binding pattern
+template: default
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    ArrayBindingPattern : [ ]
+
+    1. Return NormalCompletion(empty).
+features: [generators]
+---*/
+
+//- setup
+var iterations = 0;
+var iter = function*() {
+  iterations += 1;
+}();
+//- elems
+[]
+//- vals
+iter
+//- body
+assert.sameValue(iterations, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-ary-elem.case b/src/dstr-binding-for-await/ary-ptrn-rest-ary-elem.case
new file mode 100644
index 000000000..79a93524c
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-ary-elem.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.
+/*---
+template: default
+desc: Rest element containing an array BindingElementList pattern
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingPattern
+
+    1. Let A be ArrayCreate(0).
+    [...]
+    3. Repeat
+       [...]
+       b. If iteratorRecord.[[done]] is true, then
+          i. Return the result of performing BindingInitialization of
+             BindingPattern with A and environment as the arguments.
+       [...]
+
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    3. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+       d. If next is false, set iteratorRecord.[[done]] to true.
+       e. Else,
+          i. Let v be IteratorValue(next).
+          ii. If v is an abrupt completion, set
+              iteratorRecord.[[done]] to true.
+          iii. ReturnIfAbrupt(v).
+    4. If iteratorRecord.[[done]] is true, let v be undefined.
+    [...]
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+[...[x, y, z]]
+//- vals
+[3, 4, 5]
+//- body
+assert.sameValue(x, 3);
+assert.sameValue(y, 4);
+assert.sameValue(z, 5);
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-ary-elision.case b/src/dstr-binding-for-await/ary-ptrn-rest-ary-elision.case
new file mode 100644
index 000000000..d11cb7243
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-ary-elision.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.
+/*---
+template: default
+desc: Rest element containing an elision
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingPattern
+
+    1. Let A be ArrayCreate(0).
+    [...]
+    3. Repeat
+       [...]
+       b. If iteratorRecord.[[done]] is true, then
+          i. Return the result of performing BindingInitialization of
+             BindingPattern with A and environment as the arguments.
+       [...]
+
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    ArrayBindingPattern : [ Elision ]
+
+    1. Return the result of performing
+       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
+       as the argument.
+
+    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
+
+    Elision : ,
+
+    1. If iteratorRecord.[[done]] is false, then
+       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
+       c. ReturnIfAbrupt(next).
+       d. If next is false, set iteratorRecord.[[done]] to true.
+    2. Return NormalCompletion(empty).
+features: [generators]
+---*/
+
+//- setup
+var first = 0;
+var second = 0;
+function* g() {
+  first += 1;
+  yield;
+  second += 1;
+};
+//- elems
+[...[,]]
+//- vals
+g()
+//- body
+assert.sameValue(first, 1);
+assert.sameValue(second, 1);
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-ary-empty.case b/src/dstr-binding-for-await/ary-ptrn-rest-ary-empty.case
new file mode 100644
index 000000000..bbaea3f56
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-ary-empty.case
@@ -0,0 +1,38 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: default
+desc: Rest element containing an "empty" array pattern
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingPattern
+
+    1. Let A be ArrayCreate(0).
+    [...]
+    3. Repeat
+       [...]
+       b. If iteratorRecord.[[done]] is true, then
+          i. Return the result of performing BindingInitialization of
+             BindingPattern with A and environment as the arguments.
+       [...]
+
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    ArrayBindingPattern : [ ]
+
+    1. Return NormalCompletion(empty).
+features: [generators]
+---*/
+
+//- setup
+var iterations = 0;
+var iter = function*() {
+  iterations += 1;
+}();
+//- elems
+[...[]]
+//- vals
+iter
+//- body
+assert.sameValue(iterations, 1);
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-ary-rest.case b/src/dstr-binding-for-await/ary-ptrn-rest-ary-rest.case
new file mode 100644
index 000000000..428687e1c
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-ary-rest.case
@@ -0,0 +1,34 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: default
+desc: Rest element containing a rest element
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingPattern
+
+    1. Let A be ArrayCreate(0).
+    [...]
+    3. Repeat
+       [...]
+       b. If iteratorRecord.[[done]] is true, then
+          i. Return the result of performing BindingInitialization of
+             BindingPattern with A and environment as the arguments.
+       [...]
+---*/
+
+//- setup
+var values = [1, 2, 3];
+//- elems
+[...[...x]]
+//- vals
+values
+//- body
+assert(Array.isArray(x));
+assert.sameValue(x.length, 3);
+assert.sameValue(x[0], 1);
+assert.sameValue(x[1], 2);
+assert.sameValue(x[2], 3);
+assert.notSameValue(x, values);
+
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-id-elision-next-err.case b/src/dstr-binding-for-await/ary-ptrn-rest-id-elision-next-err.case
new file mode 100644
index 000000000..96ac1ad5a
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-id-elision-next-err.case
@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: error
+desc: Rest element following elision elements
+info: >
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
+
+    1. If Elision is present, then
+       a. Let status be the result of performing
+          IteratorDestructuringAssignmentEvaluation of Elision with
+          iteratorRecord as the argument.
+       b. ReturnIfAbrupt(status).
+    2. Return the result of performing IteratorBindingInitialization for
+       BindingRestElement with iteratorRecord and environment as arguments.
+features: [generators]
+---*/
+
+//- setup
+var iter = (function*() { throw new Test262Error(); })();
+//- elems
+[, ...x]
+//- vals
+iter
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-id-elision.case b/src/dstr-binding-for-await/ary-ptrn-rest-id-elision.case
new file mode 100644
index 000000000..0643b134d
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-id-elision.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.
+/*---
+template: default
+desc: Rest element following elision elements
+info: >
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
+
+    1. If Elision is present, then
+       a. Let status be the result of performing
+          IteratorDestructuringAssignmentEvaluation of Elision with
+          iteratorRecord as the argument.
+       b. ReturnIfAbrupt(status).
+    2. Return the result of performing IteratorBindingInitialization for
+       BindingRestElement with iteratorRecord and environment as arguments.
+---*/
+
+//- setup
+var values = [1, 2, 3, 4, 5];
+//- elems
+[ , , ...x]
+//- vals
+values
+//- body
+assert(Array.isArray(x));
+assert.sameValue(x.length, 3);
+assert.sameValue(x[0], 3);
+assert.sameValue(x[1], 4);
+assert.sameValue(x[2], 5);
+assert.notSameValue(x, values);
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-id-exhausted.case b/src/dstr-binding-for-await/ary-ptrn-rest-id-exhausted.case
new file mode 100644
index 000000000..18ab5e958
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-id-exhausted.case
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: default
+desc: RestElement applied to an exhausted iterator
+info: >
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingIdentifier
+
+    1. Let lhs be ResolveBinding(StringValue of BindingIdentifier,
+       environment).
+    2. ReturnIfAbrupt(lhs).
+    3. Let A be ArrayCreate(0).
+    4. Let n=0.
+    5. Repeat,
+       [...]
+       b. If iteratorRecord.[[done]] is true, then
+          i. If environment is undefined, return PutValue(lhs, A).
+          ii. Return InitializeReferencedBinding(lhs, A).
+features: [Symbol.iterator]
+---*/
+
+//- elems
+[, , ...x]
+//- vals
+[1, 2]
+//- body
+assert(Array.isArray(x));
+assert.sameValue(x.length, 0);
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-close.case b/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-close.case
new file mode 100644
index 000000000..2127b9eda
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-close.case
@@ -0,0 +1,21 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+template: iter-close
+desc: >
+  The iterator is properly consumed by the destructuring pattern
+---*/
+
+//- setup
+const iter = (function* () {
+  yield;
+  yield;
+})();
+
+//- elems
+[...x]
+//- iter
+iter
+//- assertions
+assert.sameValue(iter.next().done, true, 'iteration occurred as expected');
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-step-err.case b/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-step-err.case
new file mode 100644
index 000000000..48b826f78
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-step-err.case
@@ -0,0 +1,38 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: error
+desc: Error forwarding when IteratorStep returns an abrupt completion
+info: >
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingIdentifier
+
+    1. Let lhs be ResolveBinding(StringValue of BindingIdentifier,
+       environment).
+    2. ReturnIfAbrupt(lhs).
+    3. Let A be ArrayCreate(0).
+    4. Let n=0.
+    5. Repeat,
+       a. If iteratorRecord.[[done]] is false,
+          i. Let next be IteratorStep(iteratorRecord.[[iterator]]).
+          ii. If next is an abrupt completion, set iteratorRecord.[[done]] to
+              true.
+          iii. ReturnIfAbrupt(next).
+features: [generators]
+---*/
+
+//- setup
+var first = 0;
+var second = 0;
+var iter = function*() {
+  first += 1;
+  throw new Test262Error();
+  second += 1;
+}();
+//- elems
+[...x]
+//- vals
+iter
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-val-err.case b/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-val-err.case
new file mode 100644
index 000000000..5912533b8
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-id-iter-val-err.case
@@ -0,0 +1,44 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: error
+desc: Error forwarding when IteratorValue returns an abrupt completion
+info: >
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingIdentifier
+
+    1. Let lhs be ResolveBinding(StringValue of BindingIdentifier,
+       environment).
+    2. ReturnIfAbrupt(lhs).
+    3. Let A be ArrayCreate(0).
+    4. Let n=0.
+    5. Repeat,
+       [...]
+       c. Let nextValue be IteratorValue(next).
+       d. If nextValue is an abrupt completion, set iteratorRecord.[[done]] to
+          true.
+       e. ReturnIfAbrupt(nextValue).
+features: [Symbol.iterator]
+---*/
+
+//- setup
+var poisonedValue = Object.defineProperty({}, 'value', {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+var iter = {};
+iter[Symbol.iterator] = function() {
+  return {
+    next() {
+      return poisonedValue;
+    }
+  };
+};
+//- elems
+[...x]
+//- vals
+iter
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-id.case b/src/dstr-binding-for-await/ary-ptrn-rest-id.case
new file mode 100644
index 000000000..93ea865be
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-id.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.
+/*---
+template: default
+desc: Lone rest element
+info: >
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingIdentifier
+
+    [...]
+    3. Let A be ArrayCreate(0).
+    [...]
+    5. Repeat
+       [...]
+       f. Let status be CreateDataProperty(A, ToString (n), nextValue).
+       [...]
+---*/
+
+//- setup
+var values = [1, 2, 3];
+//- elems
+[...x]
+//- vals
+values
+//- body
+assert(Array.isArray(x));
+assert.sameValue(x.length, 3);
+assert.sameValue(x[0], 1);
+assert.sameValue(x[1], 2);
+assert.sameValue(x[2], 3);
+assert.notSameValue(x, values);
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-init-ary.case b/src/dstr-binding-for-await/ary-ptrn-rest-init-ary.case
new file mode 100644
index 000000000..8d302fa4c
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-init-ary.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.
+/*---
+template: default
+desc: Reset element (nested array pattern) does not support initializer
+negative:
+  phase: early
+  type: SyntaxError
+info: >
+    13.3.3 Destructuring Binding Patterns
+
+    ArrayBindingPattern[Yield] :
+        [ Elisionopt BindingRestElement[?Yield]opt ]
+        [ BindingElementList[?Yield] ]
+        [ BindingElementList[?Yield] , Elisionopt BindingRestElement[?Yield]opt ]
+---*/
+
+//- elems
+[...[ x ] = []]
+//- vals
+[]
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-init-id.case b/src/dstr-binding-for-await/ary-ptrn-rest-init-id.case
new file mode 100644
index 000000000..157935b1a
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-init-id.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.
+/*---
+template: default
+desc: Reset element (identifier) does not support initializer
+negative:
+  phase: early
+  type: SyntaxError
+info: >
+    13.3.3 Destructuring Binding Patterns
+
+    ArrayBindingPattern[Yield] :
+        [ Elisionopt BindingRestElement[?Yield]opt ]
+        [ BindingElementList[?Yield] ]
+        [ BindingElementList[?Yield] , Elisionopt BindingRestElement[?Yield]opt ]
+---*/
+
+//- elems
+[...x = []]
+//- vals
+[]
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-init-obj.case b/src/dstr-binding-for-await/ary-ptrn-rest-init-obj.case
new file mode 100644
index 000000000..e55c245fd
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-init-obj.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.
+/*---
+template: default
+desc: Reset element (nested object pattern) does not support initializer
+negative:
+  phase: early
+  type: SyntaxError
+info: >
+    13.3.3 Destructuring Binding Patterns
+
+    ArrayBindingPattern[Yield] :
+        [ Elisionopt BindingRestElement[?Yield]opt ]
+        [ BindingElementList[?Yield] ]
+        [ BindingElementList[?Yield] , Elisionopt BindingRestElement[?Yield]opt ]
+---*/
+
+//- elems
+[...{ x } = []]
+//- vals
+[]
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-not-final-ary.case b/src/dstr-binding-for-await/ary-ptrn-rest-not-final-ary.case
new file mode 100644
index 000000000..4a7b66f86
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-not-final-ary.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.
+/*---
+template: default
+desc: Rest element (array binding pattern) may not be followed by any element
+negative:
+  phase: early
+  type: SyntaxError
+info: >
+    13.3.3 Destructuring Binding Patterns
+
+    ArrayBindingPattern[Yield] :
+        [ Elisionopt BindingRestElement[?Yield]opt ]
+        [ BindingElementList[?Yield] ]
+        [ BindingElementList[?Yield] , Elisionopt BindingRestElement[?Yield]opt ]
+---*/
+
+//- elems
+[...[x], y]
+//- vals
+[1, 2, 3]
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-not-final-id.case b/src/dstr-binding-for-await/ary-ptrn-rest-not-final-id.case
new file mode 100644
index 000000000..b569bb020
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-not-final-id.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.
+/*---
+template: default
+desc: Rest element (identifier) may not be followed by any element
+negative:
+  phase: early
+  type: SyntaxError
+info: >
+    13.3.3 Destructuring Binding Patterns
+
+    ArrayBindingPattern[Yield] :
+        [ Elisionopt BindingRestElement[?Yield]opt ]
+        [ BindingElementList[?Yield] ]
+        [ BindingElementList[?Yield] , Elisionopt BindingRestElement[?Yield]opt ]
+---*/
+
+//- elems
+[...x, y]
+//- vals
+[1, 2, 3]
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-not-final-obj.case b/src/dstr-binding-for-await/ary-ptrn-rest-not-final-obj.case
new file mode 100644
index 000000000..3540f3dd1
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-not-final-obj.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.
+/*---
+template: default
+desc: Rest element (object binding pattern) may not be followed by any element
+negative:
+  phase: early
+  type: SyntaxError
+info: >
+    13.3.3 Destructuring Binding Patterns
+
+    ArrayBindingPattern[Yield] :
+        [ Elisionopt BindingRestElement[?Yield]opt ]
+        [ BindingElementList[?Yield] ]
+        [ BindingElementList[?Yield] , Elisionopt BindingRestElement[?Yield]opt ]
+---*/
+
+//- elems
+[...{ x }, y]
+//- vals
+[1, 2, 3]
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-obj-id.case b/src/dstr-binding-for-await/ary-ptrn-rest-obj-id.case
new file mode 100644
index 000000000..5270aadda
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-obj-id.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.
+/*---
+template: default
+desc: Rest element containing an object binding pattern
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingPattern
+
+    1. Let A be ArrayCreate(0).
+    [...]
+    3. Repeat
+       [...]
+       b. If iteratorRecord.[[done]] is true, then
+          i. Return the result of performing BindingInitialization of
+             BindingPattern with A and environment as the arguments.
+       [...]
+---*/
+
+//- elems
+[...{ length }]
+//- vals
+[1, 2, 3]
+//- body
+assert.sameValue(length, 3);
diff --git a/src/dstr-binding-for-await/ary-ptrn-rest-obj-prop-id.case b/src/dstr-binding-for-await/ary-ptrn-rest-obj-prop-id.case
new file mode 100644
index 000000000..17c410b43
--- /dev/null
+++ b/src/dstr-binding-for-await/ary-ptrn-rest-obj-prop-id.case
@@ -0,0 +1,34 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: default
+desc: Rest element containing an object binding pattern
+info: |
+    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
+
+    BindingRestElement : ... BindingPattern
+
+    1. Let A be ArrayCreate(0).
+    [...]
+    3. Repeat
+       [...]
+       b. If iteratorRecord.[[done]] is true, then
+          i. Return the result of performing BindingInitialization of
+             BindingPattern with A and environment as the arguments.
+       [...]
+---*/
+
+//- setup
+let length = "outer";
+//- elems
+[...{ 0: v, 1: w, 2: x, 3: y, length: z }]
+//- vals
+[7, 8, 9]
+//- body
+assert.sameValue(v, 7);
+assert.sameValue(w, 8);
+assert.sameValue(x, 9);
+assert.sameValue(y, undefined);
+assert.sameValue(z, 3);
+
+assert.sameValue(length, "outer", "the length prop is not set as a binding name");
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-func-const-async.template b/src/dstr-binding-for-await/default/for-await-of-async-func-const-async.template
new file mode 100644
index 000000000..a897bc969
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-func-const-async.template
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-const-async-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+var asyncIter = (async function*() {
+  yield* [/*{ vals }*/];
+})();
+
+async function fn() {
+  for await (const /*{ elems }*/ of asyncIter) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-func-const.template b/src/dstr-binding-for-await/default/for-await-of-async-func-const.template
new file mode 100644
index 000000000..b4a0fffd8
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-func-const.template
@@ -0,0 +1,51 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-const-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+
+async function fn() {
+  for await (const /*{ elems }*/ of [/*{ vals }*/]) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-func-let-async.template b/src/dstr-binding-for-await/default/for-await-of-async-func-let-async.template
new file mode 100644
index 000000000..6f971f061
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-func-let-async.template
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-let-async-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+var asyncIter = (async function*() {
+  yield* [/*{ vals }*/];
+})();
+
+async function fn() {
+  for await (let /*{ elems }*/ of asyncIter) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-func-let.template b/src/dstr-binding-for-await/default/for-await-of-async-func-let.template
new file mode 100644
index 000000000..c184e3b5f
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-func-let.template
@@ -0,0 +1,52 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-let-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+
+async function fn() {
+  for await (let /*{ elems }*/ of [/*{ vals }*/]) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
+
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-func-var-async.template b/src/dstr-binding-for-await/default/for-await-of-async-func-var-async.template
new file mode 100644
index 000000000..168232082
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-func-var-async.template
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-var-async-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+var asyncIter = (async function*() {
+  yield* [/*{ vals }*/];
+})();
+
+async function fn() {
+  for await (var /*{ elems }*/ of asyncIter) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-func-var.template b/src/dstr-binding-for-await/default/for-await-of-async-func-var.template
new file mode 100644
index 000000000..2d1e14265
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-func-var.template
@@ -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.
+/*---
+path: language/statements/for-await-of/async-func-dstr-var-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( var ForBinding of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+        varBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              1. Assert: lhs is a ForBinding.
+              2. Let status be the result of performing BindingInitialization
+                 for lhs passing nextValue and undefined as the arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+
+async function fn() {
+  for await (var /*{ elems }*/ of [/*{ vals }*/]) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
+
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-gen-const-async.template b/src/dstr-binding-for-await/default/for-await-of-async-gen-const-async.template
new file mode 100644
index 000000000..592433e70
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-gen-const-async.template
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-const-async-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+var asyncIter = (async function*() {
+  yield* [/*{ vals }*/];
+})();
+
+async function *fn() {
+  for await (const /*{ elems }*/ of asyncIter) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn().next()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-gen-const.template b/src/dstr-binding-for-await/default/for-await-of-async-gen-const.template
new file mode 100644
index 000000000..f8627fbd1
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-gen-const.template
@@ -0,0 +1,51 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-const-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+
+async function *fn() {
+  for await (const /*{ elems }*/ of [/*{ vals }*/]) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn().next()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-gen-let-async.template b/src/dstr-binding-for-await/default/for-await-of-async-gen-let-async.template
new file mode 100644
index 000000000..aeb133ad4
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-gen-let-async.template
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-let-async-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+var asyncIter = (async function*() {
+  yield* [/*{ vals }*/];
+})();
+
+async function *fn() {
+  for await (let /*{ elems }*/ of asyncIter) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn().next()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-gen-let.template b/src/dstr-binding-for-await/default/for-await-of-async-gen-let.template
new file mode 100644
index 000000000..99a60f8dd
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-gen-let.template
@@ -0,0 +1,52 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-let-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+
+async function *fn() {
+  for await (let /*{ elems }*/ of [/*{ vals }*/]) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn().next()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
+
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-gen-var-async.template b/src/dstr-binding-for-await/default/for-await-of-async-gen-var-async.template
new file mode 100644
index 000000000..c251fda07
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-gen-var-async.template
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-var-async-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+var asyncIter = (async function*() {
+  yield* [/*{ vals }*/];
+})();
+
+async function *fn() {
+  for await (var /*{ elems }*/ of asyncIter) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn().next()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/default/for-await-of-async-gen-var.template b/src/dstr-binding-for-await/default/for-await-of-async-gen-var.template
new file mode 100644
index 000000000..798f4fa22
--- /dev/null
+++ b/src/dstr-binding-for-await/default/for-await-of-async-gen-var.template
@@ -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.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-var-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( var ForBinding of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+        varBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              1. Assert: lhs is a ForBinding.
+              2. Let status be the result of performing BindingInitialization
+                 for lhs passing nextValue and undefined as the arguments.
+          [...]
+---*/
+
+var iterCount = 0;
+
+async function *fn() {
+  for await (var /*{ elems }*/ of [/*{ vals }*/]) {
+    /*{ body }*/
+
+    iterCount += 1;
+  }
+}
+
+fn().next()
+  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
+  .then($DONE, $DONE);
+
diff --git a/src/dstr-binding-for-await/error/for-await-of-async-func-const.template b/src/dstr-binding-for-await/error/for-await-of-async-func-const.template
new file mode 100644
index 000000000..dc2fc2499
--- /dev/null
+++ b/src/dstr-binding-for-await/error/for-await-of-async-func-const.template
@@ -0,0 +1,48 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-const-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+      lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function fn() {
+  for await (const /*{ elems }*/ of [/*{ vals }*/]) {
+    return;
+  }
+}
+
+fn()
+  .then(_ => { throw new Test262Error("Expected async function to reject, but resolved."); }, ({ constructor }) => assert.sameValue(constructor, /*{ error }*/))
+  .then($DONE, $DONE);
+
diff --git a/src/dstr-binding-for-await/error/for-await-of-async-func-let.template b/src/dstr-binding-for-await/error/for-await-of-async-func-let.template
new file mode 100644
index 000000000..291b51a64
--- /dev/null
+++ b/src/dstr-binding-for-await/error/for-await-of-async-func-let.template
@@ -0,0 +1,48 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-let-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+      lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function fn() {
+  for await (let /*{ elems }*/ of [/*{ vals }*/]) {
+    return;
+  }
+}
+
+fn()
+  .then(_ => { throw new Test262Error("Expected async function to reject, but resolved."); }, ({ constructor }) => assert.sameValue(constructor, /*{ error }*/))
+  .then($DONE, $DONE);
+
diff --git a/src/dstr-binding-for-await/error/for-await-of-async-func-var.template b/src/dstr-binding-for-await/error/for-await-of-async-func-var.template
new file mode 100644
index 000000000..ab9ae9712
--- /dev/null
+++ b/src/dstr-binding-for-await/error/for-await-of-async-func-var.template
@@ -0,0 +1,47 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-var-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( var ForBinding of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+        varBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function fn() {
+  for await (var /*{ elems }*/ of [/*{ vals }*/]) {
+    return;
+  }
+}
+
+fn()
+  .then(_ => { throw new Test262Error("Expected async function to reject, but resolved."); }, ({ constructor }) => assert.sameValue(constructor, /*{ error }*/))
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/error/for-await-of-async-gen-const.template b/src/dstr-binding-for-await/error/for-await-of-async-gen-const.template
new file mode 100644
index 000000000..85241ea97
--- /dev/null
+++ b/src/dstr-binding-for-await/error/for-await-of-async-gen-const.template
@@ -0,0 +1,52 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-const-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+      lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function * gen() {
+  for await (const /*{ elems }*/ of [/*{ vals }*/]) {
+    return;
+  }
+}
+
+gen().next()
+  .then(_ => {
+    throw new Test262Error("Expected async function to reject, but resolved.");
+  }, ({ constructor }) => {
+    assert.sameValue(constructor, /*{ error }*/);
+    /*{ rejectBody }*/
+  })
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/error/for-await-of-async-gen-let.template b/src/dstr-binding-for-await/error/for-await-of-async-gen-let.template
new file mode 100644
index 000000000..f75e5e204
--- /dev/null
+++ b/src/dstr-binding-for-await/error/for-await-of-async-gen-let.template
@@ -0,0 +1,52 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-let-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( var ForBinding of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+        varBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function * gen() {
+  for await (let /*{ elems }*/ of [/*{ vals }*/]) {
+    return;
+  }
+}
+
+gen().next()
+  .then(_ => {
+    throw new Test262Error("Expected async function to reject, but resolved.");
+  }, ({ constructor }) => {
+    assert.sameValue(constructor, /*{ error }*/);
+    /*{ rejectBody }*/
+  })
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/error/for-await-of-async-gen-var.template b/src/dstr-binding-for-await/error/for-await-of-async-gen-var.template
new file mode 100644
index 000000000..c0bbe2f0f
--- /dev/null
+++ b/src/dstr-binding-for-await/error/for-await-of-async-gen-var.template
@@ -0,0 +1,53 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-var-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+      lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function * gen() {
+  for await (var /*{ elems }*/ of [/*{ vals }*/]) {
+    return;
+  }
+}
+
+gen().next()
+  .then(_ => {
+    throw new Test262Error("Expected async function to reject, but resolved.");
+  }, ({ constructor }) => {
+    assert.sameValue(constructor, /*{ error }*/);
+    /*{ rejectBody }*/
+  })
+  .then($DONE, $DONE);
+
diff --git a/src/dstr-binding-for-await/iter-close/for-await-of-async-func-const.template b/src/dstr-binding-for-await/iter-close/for-await-of-async-func-const.template
new file mode 100644
index 000000000..810e76c3f
--- /dev/null
+++ b/src/dstr-binding-for-await/iter-close/for-await-of-async-func-const.template
@@ -0,0 +1,50 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/statements/for-await-of/async-func-dstr-const-
+name: for-await-of statement in an async function
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function fn() {
+  for await (const /*{ elems }*/ of [/*{ iter }*/]) {
+    return;
+  }
+}
+
+fn()
+  .then(() => {
+    /*{ assertions }*/
+  })
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/iter-close/for-await-of-async-func-let.template b/src/dstr-binding-for-await/iter-close/for-await-of-async-func-let.template
new file mode 100644
index 000000000..b58a49e0d
--- /dev/null
+++ b/src/dstr-binding-for-await/iter-close/for-await-of-async-func-let.template
@@ -0,0 +1,50 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-let-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function fn() {
+  for await (let /*{ elems }*/ of [/*{ iter }*/]) {
+    return;
+  }
+}
+
+fn()
+  .then(() => {
+    /*{ assertions }*/
+  })
+  .then($DONE, $DONE);
+
diff --git a/src/dstr-binding-for-await/iter-close/for-await-of-async-func-var.template b/src/dstr-binding-for-await/iter-close/for-await-of-async-func-var.template
new file mode 100644
index 000000000..4f38c2f89
--- /dev/null
+++ b/src/dstr-binding-for-await/iter-close/for-await-of-async-func-var.template
@@ -0,0 +1,46 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-func-dstr-var-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( var ForBinding of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+        varBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              1. Assert: lhs is a ForBinding.
+              2. Let status be the result of performing BindingInitialization
+                 for lhs passing nextValue and undefined as the arguments.
+          [...]
+---*/
+
+async function fn() {
+  for await (var /*{ elems }*/ of [/*{ iter }*/]) {
+    return;
+  }
+}
+
+fn()
+  .then(() => {
+    /*{ assertions }*/
+  })
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-const.template b/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-const.template
new file mode 100644
index 000000000..718187bba
--- /dev/null
+++ b/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-const.template
@@ -0,0 +1,50 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-const-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function* fn() {
+  for await (const /*{ elems }*/ of [/*{ iter }*/]) {
+    return;
+  }
+}
+
+fn()
+  .next()
+  .then(() => {
+    /*{ assertions }*/
+  })
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-let.template b/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-let.template
new file mode 100644
index 000000000..020dee9bc
--- /dev/null
+++ b/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-let.template
@@ -0,0 +1,50 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-let-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( ForDeclaration of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
+        lexicalBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              [...]
+          iii. Else,
+               1. Assert: lhsKind is lexicalBinding.
+               2. Assert: lhs is a ForDeclaration.
+               3. Let status be the result of performing BindingInitialization
+                  for lhs passing nextValue and iterationEnv as arguments.
+          [...]
+---*/
+
+async function* fn() {
+  for await (let /*{ elems }*/ of [/*{ iter }*/]) {
+    return;
+  }
+}
+
+fn()
+  .next()
+  .then(() => {
+    /*{ assertions }*/
+  })
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-var.template b/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-var.template
new file mode 100644
index 000000000..0d95fda7d
--- /dev/null
+++ b/src/dstr-binding-for-await/iter-close/for-await-of-async-gen-var.template
@@ -0,0 +1,47 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/statements/for-await-of/async-gen-dstr-var-
+name: for-await-of statement
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [destructuring-binding, async-iteration]
+flags: [async]
+info: |
+    IterationStatement :
+        for await ( var ForBinding of AssignmentExpression ) Statement
+
+    [...]
+    2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
+        varBinding, labelSet, async).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. Let destructuring be IsDestructuring of lhs.
+    [...]
+    6. Repeat
+       [...]
+       j. If destructuring is false, then
+          [...]
+       k. Else
+          i. If lhsKind is assignment, then
+             [...]
+          ii. Else if lhsKind is varBinding, then
+              1. Assert: lhs is a ForBinding.
+              2. Let status be the result of performing BindingInitialization
+                 for lhs passing nextValue and undefined as the arguments.
+          [...]
+---*/
+
+async function* fn() {
+  for await (var /*{ elems }*/ of [/*{ iter }*/]) {
+    return;
+  }
+}
+
+fn()
+  .next()
+  .then(() => {
+    /*{ assertions }*/
+  })
+  .then($DONE, $DONE);
diff --git a/src/dstr-binding-for-await/obj-init-null.case b/src/dstr-binding-for-await/obj-init-null.case
new file mode 100644
index 000000000..23aa54c10
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-init-null.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.
+/*---
+template: error
+desc: Value specifed for object binding pattern must be object coercible (null)
+info: |
+    Runtime Semantics: BindingInitialization
+
+    ObjectBindingPattern : { }
+
+    1. Return NormalCompletion(empty).
+---*/
+
+//- elems
+{}
+//- vals
+null
+//- error
+TypeError
diff --git a/src/dstr-binding-for-await/obj-init-undefined.case b/src/dstr-binding-for-await/obj-init-undefined.case
new file mode 100644
index 000000000..90d27b009
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-init-undefined.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.
+/*---
+template: error
+desc: Value specifed for object binding pattern must be object coercible (undefined)
+info: |
+    Runtime Semantics: BindingInitialization
+
+    ObjectBindingPattern : { }
+
+    1. Return NormalCompletion(empty).
+---*/
+
+//- elems
+{}
+//- vals
+undefined
+//- error
+TypeError
diff --git a/src/dstr-binding-for-await/obj-ptrn-empty.case b/src/dstr-binding-for-await/obj-ptrn-empty.case
new file mode 100644
index 000000000..1431451d4
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-empty.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.
+/*---
+template: default
+desc: No property access occurs for an "empty" object binding pattern
+info: |
+    Runtime Semantics: BindingInitialization
+
+    ObjectBindingPattern : { }
+
+    1. Return NormalCompletion(empty).
+---*/
+
+//- setup
+var accessCount = 0;
+var obj = Object.defineProperty({}, 'attr', {
+  get: function() {
+    accessCount += 1;
+  }
+});
+//- elems
+{}
+//- vals
+obj
+//- body
+assert.sameValue(accessCount, 0);
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-get-value-err.case b/src/dstr-binding-for-await/obj-ptrn-id-get-value-err.case
new file mode 100644
index 000000000..b2362e7eb
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-get-value-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.
+/*---
+template: error
+desc: Error thrown when accessing the corresponding property of the value object
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    4. Let v be GetV(value, propertyName).
+    5. ReturnIfAbrupt(v).
+---*/
+
+//- setup
+var poisonedProperty = Object.defineProperty({}, 'poisoned', {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+//- elems
+{ poisoned }
+//- vals
+poisonedProperty
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-arrow.case b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-arrow.case
new file mode 100644
index 000000000..998eff71d
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-arrow.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: SingleNameBinding assigns `name` to arrow functions
+template: default
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    6. If Initializer is present and v is undefined, then
+       [...]
+       d. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          i. Let hasNameProperty be HasOwnProperty(v, "name").
+          ii. ReturnIfAbrupt(hasNameProperty).
+          iii. If hasNameProperty is false, perform SetFunctionName(v,
+               bindingId).
+---*/
+
+//- elems
+{ arrow = () => {} }
+//- vals
+{}
+//- body
+assert.sameValue(arrow.name, 'arrow');
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-class.case b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-class.case
new file mode 100644
index 000000000..32efdf247
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-class.case
@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: SingleNameBinding assigns `name` to "anonymous" classes
+template: default
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    6. If Initializer is present and v is undefined, then
+       [...]
+       d. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          i. Let hasNameProperty be HasOwnProperty(v, "name").
+          ii. ReturnIfAbrupt(hasNameProperty).
+          iii. If hasNameProperty is false, perform SetFunctionName(v,
+               bindingId).
+---*/
+
+//- elems
+{ cls = class {}, xCls = class X {}, xCls2 = class { static name() {} } }
+//- vals
+{}
+//- body
+assert.sameValue(cls.name, 'cls');
+assert.notSameValue(xCls.name, 'xCls');
+assert.notSameValue(xCls2.name, 'xCls2');
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-cover.case b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-cover.case
new file mode 100644
index 000000000..219617289
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-cover.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: SingleNameBinding assigns `name` to "anonymous" functions "through" cover grammar
+template: default
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    6. If Initializer is present and v is undefined, then
+       [...]
+       d. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          i. Let hasNameProperty be HasOwnProperty(v, "name").
+          ii. ReturnIfAbrupt(hasNameProperty).
+          iii. If hasNameProperty is false, perform SetFunctionName(v,
+               bindingId).
+---*/
+
+//- elems
+{ cover = (function () {}), xCover = (0, function() {})  }
+//- vals
+{}
+//- body
+assert.sameValue(cover.name, 'cover');
+assert.notSameValue(xCover.name, 'xCover');
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-fn.case b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-fn.case
new file mode 100644
index 000000000..a2a99b438
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-fn.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: SingleNameBinding assigns name to "anonymous" functions
+template: default
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    6. If Initializer is present and v is undefined, then
+       [...]
+       d. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          i. Let hasNameProperty be HasOwnProperty(v, "name").
+          ii. ReturnIfAbrupt(hasNameProperty).
+          iii. If hasNameProperty is false, perform SetFunctionName(v,
+               bindingId).
+---*/
+
+//- elems
+{ fn = function () {}, xFn = function x() {} }
+//- vals
+{}
+//- body
+assert.sameValue(fn.name, 'fn');
+assert.notSameValue(xFn.name, 'xFn');
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-gen.case b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-gen.case
new file mode 100644
index 000000000..3eb8bcd5d
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-init-fn-name-gen.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: SingleNameBinding assigns name to "anonymous" generator functions
+template: default
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    6. If Initializer is present and v is undefined, then
+       [...]
+       d. If IsAnonymousFunctionDefinition(Initializer) is true, then
+          i. Let hasNameProperty be HasOwnProperty(v, "name").
+          ii. ReturnIfAbrupt(hasNameProperty).
+          iii. If hasNameProperty is false, perform SetFunctionName(v,
+               bindingId).
+---*/
+
+//- elems
+{ gen = function* () {}, xGen = function* x() {} }
+//- vals
+{}
+//- body
+assert.sameValue(gen.name, 'gen');
+assert.notSameValue(xGen.name, 'xGen');
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-init-skipped.case b/src/dstr-binding-for-await/obj-ptrn-id-init-skipped.case
new file mode 100644
index 000000000..8d666d508
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-init-skipped.case
@@ -0,0 +1,31 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Destructuring initializer is not evaluated when value is not `undefined`
+template: default
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    6. If Initializer is present and v is undefined, then
+       [...]
+    [...]
+---*/
+
+//- setup
+var initCount = 0;
+function counter() {
+  initCount += 1;
+}
+//- elems
+{ w = counter(), x = counter(), y = counter(), z = counter() }
+//- vals
+{ w: null, x: 0, y: false, z: '' }
+//- body
+assert.sameValue(w, null);
+assert.sameValue(x, 0);
+assert.sameValue(y, false);
+assert.sameValue(z, '');
+assert.sameValue(initCount, 0);
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-init-throws.case b/src/dstr-binding-for-await/obj-ptrn-id-init-throws.case
new file mode 100644
index 000000000..411983d82
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-init-throws.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.
+/*---
+template: error
+desc: Error thrown when evaluating the initializer
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    6. If Initializer is present and v is undefined, then
+       a. Let  defaultValue be the result of evaluating Initializer.
+       b. Let v be GetValue(defaultValue).
+       c. ReturnIfAbrupt(v).
+---*/
+
+//- setup
+function thrower() {
+  throw new Test262Error();
+}
+//- elems
+{ x = thrower() }
+//- vals
+{}
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-init-unresolvable.case b/src/dstr-binding-for-await/obj-ptrn-id-init-unresolvable.case
new file mode 100644
index 000000000..9e00a4aad
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-init-unresolvable.case
@@ -0,0 +1,29 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Destructuring initializer is an unresolvable reference
+template: error
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    5. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+
+    6.2.4.1 GetValue ( V )
+
+    1. ReturnIfAbrupt(V).
+    2. If Type(V) is not Reference, return V.
+    3. Let base be GetBase(V).
+    4. If IsUnresolvableReference(V), throw a ReferenceError exception.
+---*/
+
+//- elems
+{ x = unresolvableReference }
+//- vals
+{}
+//- error
+ReferenceError
diff --git a/src/dstr-binding-for-await/obj-ptrn-id-trailing-comma.case b/src/dstr-binding-for-await/obj-ptrn-id-trailing-comma.case
new file mode 100644
index 000000000..3cfb1f710
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-id-trailing-comma.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.
+/*---
+template: default
+desc: Trailing comma is allowed following BindingPropertyList
+info: |
+    13.3.3 Destructuring Binding Patterns
+
+    ObjectBindingPattern[Yield] :
+        { }
+        { BindingPropertyList[?Yield] }
+        { BindingPropertyList[?Yield] , }
+---*/
+
+//- elems
+{ x, }
+//- vals
+{ x: 23 }
+//- body
+assert.sameValue(x, 23);
diff --git a/src/dstr-binding-for-await/obj-ptrn-list-err.case b/src/dstr-binding-for-await/obj-ptrn-list-err.case
new file mode 100644
index 000000000..fd545b398
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-list-err.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.
+/*---
+template: error
+desc: Binding property list evaluation is interrupted by an abrupt completion
+info: |
+    13.3.3.5 Runtime Semantics: BindingInitialization
+
+    BindingPropertyList : BindingPropertyList , BindingProperty
+
+    1. Let status be the result of performing BindingInitialization for
+       BindingPropertyList using value and environment as arguments.
+    2. ReturnIfAbrupt(status).
+---*/
+
+//- setup
+var initCount = 0;
+function thrower() {
+  throw new Test262Error();
+}
+//- elems
+{ a, b = thrower(), c = ++initCount }
+//- vals
+{}
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-ary-init.case b/src/dstr-binding-for-await/obj-ptrn-prop-ary-init.case
new file mode 100644
index 000000000..d5cded54a
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-ary-init.case
@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: default
+desc: Object binding pattern with "nested" array binding pattern using initializer
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    [...]
+    4. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization for BindingPattern
+       passing v and environment as arguments.
+---*/
+
+//- elems
+{ w: [x, y, z] = [4, 5, 6] }
+//- vals
+{}
+//- body
+assert.sameValue(x, 4);
+assert.sameValue(y, 5);
+assert.sameValue(z, 6);
+
+assert.throws(ReferenceError, function() {
+  w;
+});
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-ary-trailing-comma.case b/src/dstr-binding-for-await/obj-ptrn-prop-ary-trailing-comma.case
new file mode 100644
index 000000000..7cccbd084
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-ary-trailing-comma.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.
+/*---
+template: default
+desc: Trailing comma is allowed following BindingPropertyList
+info: |
+    13.3.3 Destructuring Binding Patterns
+
+    ObjectBindingPattern[Yield] :
+        { }
+        { BindingPropertyList[?Yield] }
+        { BindingPropertyList[?Yield] , }
+---*/
+
+//- elems
+{ x: [y], }
+//- vals
+{ x: [45] }
+//- body
+assert.sameValue(y,45);
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-ary-value-null.case b/src/dstr-binding-for-await/obj-ptrn-prop-ary-value-null.case
new file mode 100644
index 000000000..af5b3ec08
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-ary-value-null.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.
+/*---
+template: error
+desc: Object binding pattern with "nested" array binding pattern taking the `null` value
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    [...]
+    3. If Initializer is present and v is undefined, then
+       [...]
+    4. Return the result of performing BindingInitialization for BindingPattern
+       passing v and environment as arguments.
+---*/
+
+//- elems
+{ w: [x, y, z] = [4, 5, 6] }
+//- vals
+{ w: null }
+//- error
+TypeError
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-ary.case b/src/dstr-binding-for-await/obj-ptrn-prop-ary.case
new file mode 100644
index 000000000..40a73c566
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-ary.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.
+/*---
+template: default
+desc: Object binding pattern with "nested" array binding pattern not using initializer
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    [...]
+    3. If Initializer is present and v is undefined, then
+       [...]
+    4. Return the result of performing BindingInitialization for BindingPattern
+       passing v and environment as arguments.
+---*/
+
+//- elems
+{ w: [x, y, z] = [4, 5, 6] }
+//- vals
+{ w: [7, undefined, ] }
+//- body
+assert.sameValue(x, 7);
+assert.sameValue(y, undefined);
+assert.sameValue(z, undefined);
+
+assert.throws(ReferenceError, function() {
+  w;
+});
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-eval-err.case b/src/dstr-binding-for-await/obj-ptrn-prop-eval-err.case
new file mode 100644
index 000000000..12e985009
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-eval-err.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: Evaluation of property name returns an abrupt completion
+template: error
+info: |
+    13.3.3.5 Runtime Semantics: BindingInitialization
+
+    BindingProperty : PropertyName : BindingElement
+
+    1. Let P be the result of evaluating PropertyName
+    2. ReturnIfAbrupt(P).
+---*/
+
+//- setup
+function thrower() {
+  throw new Test262Error();
+}
+//- elems
+{ [thrower()]: x }
+//- vals
+{}
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-id-get-value-err.case b/src/dstr-binding-for-await/obj-ptrn-prop-id-get-value-err.case
new file mode 100644
index 000000000..5b6c9d14d
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-id-get-value-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: Error thrown when accessing the corresponding property of the value object
+template: error
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    1. Let v be GetV(value, propertyName).
+    2. ReturnIfAbrupt(v).
+---*/
+
+//- setup
+var initEvalCount = 0;
+var poisonedProperty = Object.defineProperty({}, 'poisoned', {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+//- elems
+{ poisoned: x = ++initEvalCount }
+//- vals
+poisonedProperty
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-id-init-skipped.case b/src/dstr-binding-for-await/obj-ptrn-prop-id-init-skipped.case
new file mode 100644
index 000000000..ad6d039b1
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-id-init-skipped.case
@@ -0,0 +1,43 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Destructuring initializer is not evaluated when value is not `undefined`
+template: default
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    3. If Initializer is present and v is undefined, then
+    [...]
+---*/
+
+//- setup
+var initCount = 0;
+function counter() {
+  initCount += 1;
+}
+//- elems
+{ s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() }
+//- vals
+{ s: null, u: 0, w: false, y: '' }
+//- body
+assert.sameValue(t, null);
+assert.sameValue(v, 0);
+assert.sameValue(x, false);
+assert.sameValue(z, '');
+assert.sameValue(initCount, 0);
+
+assert.throws(ReferenceError, function() {
+  s;
+});
+assert.throws(ReferenceError, function() {
+  u;
+});
+assert.throws(ReferenceError, function() {
+  w;
+});
+assert.throws(ReferenceError, function() {
+  y;
+});
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-id-init-throws.case b/src/dstr-binding-for-await/obj-ptrn-prop-id-init-throws.case
new file mode 100644
index 000000000..07d185806
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-id-init-throws.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.
+/*---
+template: error
+desc: Error thrown when evaluating the initializer
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    4. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+---*/
+
+//- setup
+function thrower() {
+  throw new Test262Error();
+}
+//- elems
+{ x: y = thrower() }
+//- vals
+{}
+//- error
+Test262Error
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-id-init-unresolvable.case b/src/dstr-binding-for-await/obj-ptrn-prop-id-init-unresolvable.case
new file mode 100644
index 000000000..d7192fad3
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-id-init-unresolvable.case
@@ -0,0 +1,29 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: Destructuring initializer is an unresolvable reference
+template: error
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    BindingElement : BindingPattern Initializer_opt
+
+    [...]
+    4. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+
+    6.2.4.1 GetValue ( V )
+
+    1. ReturnIfAbrupt(V).
+    2. If Type(V) is not Reference, return V.
+    3. Let base be GetBase(V).
+    4. If IsUnresolvableReference(V), throw a ReferenceError exception.
+---*/
+
+//- elems
+{ x: y = unresolvableReference }
+//- vals
+{}
+//- error
+ReferenceError
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-id-init.case b/src/dstr-binding-for-await/obj-ptrn-prop-id-init.case
new file mode 100644
index 000000000..4ec47bb8e
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-id-init.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.
+/*---
+template: default
+desc: Binding as specified via property name, identifier, and initializer
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+{ x: y = 33 }
+//- vals
+{ }
+//- body
+assert.sameValue(y, 33);
+assert.throws(ReferenceError, function() {
+  x;
+});
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-id-trailing-comma.case b/src/dstr-binding-for-await/obj-ptrn-prop-id-trailing-comma.case
new file mode 100644
index 000000000..c131b3e34
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-id-trailing-comma.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.
+/*---
+template: default
+desc: Trailing comma is allowed following BindingPropertyList
+info: |
+    13.3.3 Destructuring Binding Patterns
+
+    ObjectBindingPattern[Yield] :
+        { }
+        { BindingPropertyList[?Yield] }
+        { BindingPropertyList[?Yield] , }
+---*/
+
+//- elems
+{ x: y, }
+//- vals
+{ x: 23 }
+//- body
+assert.sameValue(y, 23);
+
+assert.throws(ReferenceError, function() {
+  x;
+});
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-id.case b/src/dstr-binding-for-await/obj-ptrn-prop-id.case
new file mode 100644
index 000000000..6ddeaba2b
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-id.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.
+/*---
+template: default
+desc: Binding as specified via property name and identifier
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    SingleNameBinding : BindingIdentifier Initializer_opt
+
+    [...]
+    7. Return InitializeReferencedBinding(lhs, v).
+---*/
+
+//- elems
+{ x: y }
+//- vals
+{ x: 23 }
+//- body
+assert.sameValue(y, 23);
+assert.throws(ReferenceError, function() {
+  x;
+});
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-obj-init.case b/src/dstr-binding-for-await/obj-ptrn-prop-obj-init.case
new file mode 100644
index 000000000..6132854fb
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-obj-init.case
@@ -0,0 +1,28 @@
+// Copyright (C) 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+template: default
+desc: Object binding pattern with "nested" object binding pattern using initializer
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    [...]
+    4. If Initializer is present and v is undefined, then
+       a. Let defaultValue be the result of evaluating Initializer.
+       b. Set v to ? GetValue(defaultValue).
+    4. Return the result of performing BindingInitialization for BindingPattern
+       passing v and environment as arguments.
+---*/
+
+//- elems
+{ w: { x, y, z } = { x: 4, y: 5, z: 6 } }
+//- vals
+{ w: undefined }
+//- body
+assert.sameValue(x, 4);
+assert.sameValue(y, 5);
+assert.sameValue(z, 6);
+
+assert.throws(ReferenceError, function() {
+  w;
+});
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-obj-value-null.case b/src/dstr-binding-for-await/obj-ptrn-prop-obj-value-null.case
new file mode 100644
index 000000000..2ea5ba4d0
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-obj-value-null.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.
+/*---
+template: error
+desc: Object binding pattern with "nested" object binding pattern taking the `null` value
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    [...]
+    3. If Initializer is present and v is undefined, then
+       [...]
+    4. Return the result of performing BindingInitialization for BindingPattern
+       passing v and environment as arguments.
+---*/
+
+//- elems
+{ w: { x, y, z } = { x: 4, y: 5, z: 6 } }
+//- vals
+{ w: null }
+//- error
+TypeError
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-obj-value-undef.case b/src/dstr-binding-for-await/obj-ptrn-prop-obj-value-undef.case
new file mode 100644
index 000000000..a19912f83
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-obj-value-undef.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.
+/*---
+template: error
+desc: Object binding pattern with "nested" object binding pattern taking the `null` value
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    [...]
+    3. If Initializer is present and v is undefined, then
+       [...]
+    4. Return the result of performing BindingInitialization for BindingPattern
+       passing v and environment as arguments.
+---*/
+
+//- elems
+{ w: { x, y, z } = undefined }
+//- vals
+{ }
+//- error
+TypeError
diff --git a/src/dstr-binding-for-await/obj-ptrn-prop-obj.case b/src/dstr-binding-for-await/obj-ptrn-prop-obj.case
new file mode 100644
index 000000000..c38a0b8a2
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-prop-obj.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.
+/*---
+template: default
+desc: Object binding pattern with "nested" object binding pattern not using initializer
+info: |
+    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
+
+    [...]
+    3. If Initializer is present and v is undefined, then
+       [...]
+    4. Return the result of performing BindingInitialization for BindingPattern
+       passing v and environment as arguments.
+---*/
+
+//- elems
+{ w: { x, y, z } = { x: 4, y: 5, z: 6 } }
+//- vals
+{ w: { x: undefined, z: 7 } }
+//- body
+assert.sameValue(x, undefined);
+assert.sameValue(y, undefined);
+assert.sameValue(z, 7);
+
+assert.throws(ReferenceError, function() {
+  w;
+});
diff --git a/src/dstr-binding-for-await/obj-ptrn-rest-getter.case b/src/dstr-binding-for-await/obj-ptrn-rest-getter.case
new file mode 100644
index 000000000..c5360e5e5
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-rest-getter.case
@@ -0,0 +1,26 @@
+// Copyright (C) 2017 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    Getter is called when obj is being deconstructed to a rest Object
+template: default
+esid: pending
+includes: [propertyHelper.js]
+features: [object-rest]
+---*/
+
+//- setup
+var count = 0;
+//- elems
+{...x}
+//- vals
+{ get v() { count++; return 2; } }
+//- body
+assert.sameValue(x.v, 2);
+assert.sameValue(count, 1);
+
+verifyEnumerable(x, "v");
+verifyWritable(x, "v");
+verifyConfigurable(x, "v");
+
diff --git a/src/dstr-binding-for-await/obj-ptrn-rest-nested-obj.case b/src/dstr-binding-for-await/obj-ptrn-rest-nested-obj.case
new file mode 100644
index 000000000..8fb0bb2d1
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-rest-nested-obj.case
@@ -0,0 +1,25 @@
+// Copyright (C) 2017 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an object literal, it should be parsed
+    parsed as a DestructuringAssignmentPattern and evaluated as a destructuring
+    assignment.
+template: default
+esid: pending
+features: [object-rest]
+---*/
+
+//- setup
+var obj = {a: 3, b: 4};
+//- elems
+{a, b, ...{c, e}}
+//- vals
+{a: 1, b: 2, c: 3, d: 4, e: 5}
+//- body
+assert.sameValue(a, 1);
+assert.sameValue(b, 2);
+assert.sameValue(c, 3);
+assert.sameValue(e, 5);
+
diff --git a/src/dstr-binding-for-await/obj-ptrn-rest-obj-nested-rest.case b/src/dstr-binding-for-await/obj-ptrn-rest-obj-nested-rest.case
new file mode 100644
index 000000000..a6eb8c024
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-rest-obj-nested-rest.case
@@ -0,0 +1,34 @@
+// Copyright (C) 2017 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    When DestructuringAssignmentTarget is an object literal, it should be parsed
+    parsed as a DestructuringAssignmentPattern and evaluated as a destructuring
+    assignment and object rest desconstruction is allowed in that case.
+template: default
+esid: pending
+includes: [propertyHelper.js]
+features: [object-rest]
+---*/
+
+//- elems
+{a, b, ...{c, ...rest}}
+//- vals
+{a: 1, b: 2, c: 3, d: 4, e: 5}
+//- body
+assert.sameValue(a, 1);
+assert.sameValue(b, 2);
+assert.sameValue(c, 3);
+
+assert.sameValue(rest.d, 4);
+assert.sameValue(rest.e, 5);
+
+verifyEnumerable(rest, "d");
+verifyWritable(rest, "d");
+verifyConfigurable(rest, "d");
+
+verifyEnumerable(rest, "e");
+verifyWritable(rest, "e");
+verifyConfigurable(rest, "e");
+
diff --git a/src/dstr-binding-for-await/obj-ptrn-rest-obj-own-property.case b/src/dstr-binding-for-await/obj-ptrn-rest-obj-own-property.case
new file mode 100644
index 000000000..71c375adc
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-rest-obj-own-property.case
@@ -0,0 +1,24 @@
+// Copyright (C) 2017 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    Rest object contains just soruce object's own properties
+template: default
+esid: pending
+includes: [propertyHelper.js]
+features: [object-rest]
+---*/
+
+//- setup
+var o = Object.create({ x: 1, y: 2 });
+o.z = 3;
+//- elems
+{ x, ...{y , z} }
+//- vals
+o
+//- body
+assert.sameValue(x, 1);
+assert.sameValue(y, undefined);
+assert.sameValue(z, 3);
+
diff --git a/src/dstr-binding-for-await/obj-ptrn-rest-skip-non-enumerable.case b/src/dstr-binding-for-await/obj-ptrn-rest-skip-non-enumerable.case
new file mode 100644
index 000000000..869ffd241
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-rest-skip-non-enumerable.case
@@ -0,0 +1,32 @@
+// Copyright (C) 2017 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    Rest object doesn't contain non-enumerable properties
+template: default
+esid: pending
+includes: [propertyHelper.js]
+features: [object-rest]
+---*/
+
+//- setup
+var o = {a: 3, b: 4};
+Object.defineProperty(o, "x", { value: 4, enumerable: false });
+//- elems
+{...rest}
+//- vals
+o
+//- body
+assert.sameValue(rest.a, 3);
+assert.sameValue(rest.b, 4);
+assert.sameValue(rest.x, undefined);
+
+verifyEnumerable(rest, "a");
+verifyWritable(rest, "a");
+verifyConfigurable(rest, "a");
+
+verifyEnumerable(rest, "b");
+verifyWritable(rest, "b");
+verifyConfigurable(rest, "b");
+
diff --git a/src/dstr-binding-for-await/obj-ptrn-rest-val-obj.case b/src/dstr-binding-for-await/obj-ptrn-rest-val-obj.case
new file mode 100644
index 000000000..0379ddd94
--- /dev/null
+++ b/src/dstr-binding-for-await/obj-ptrn-rest-val-obj.case
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: >
+    Rest object contains just unextracted data
+template: default
+esid: pending
+includes: [propertyHelper.js]
+features: [object-rest]
+---*/
+
+//- elems
+{a, b, ...rest}
+//- vals
+{x: 1, y: 2, a: 5, b: 3}
+//- body
+assert.sameValue(rest.x, 1);
+assert.sameValue(rest.y, 2);
+assert.sameValue(rest.a, undefined);
+assert.sameValue(rest.b, undefined);
+
+verifyEnumerable(rest, "x");
+verifyWritable(rest, "x");
+verifyConfigurable(rest, "x");
+
+verifyEnumerable(rest, "y");
+verifyWritable(rest, "y");
+verifyConfigurable(rest, "y");
+