Add templates for dstr-binding w/ for-await-of looping over async iterators

src/dstr-binding/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);

src/dstr-binding/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);

src/dstr-binding/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);

src/dstr-binding/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);

src/dstr-binding/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);

src/dstr-binding/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);