Import tests from Google V8 (generator syntax)

These tests are derived from the following files within the Google V8
project:

    test/mjsunit/es6/generators-parsing.js

test/language/identifiers/yield-as-binding-identifier-in-strict.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a reserved identifier in strict mode code and may not be used
+      as an identifier.
+  es6id: 12.1.1
+  negative: SyntaxError
+  flags: [onlyStrict]
+ ---*/
+
+var yield = 13;

test/language/identifiers/yield-as-key.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` may be used as a literal property name in an object literal.
+  es6id: 12.1.1
+ ---*/
+
+({ yield: 1 });

test/language/identifiers/yield-as-label-in-sloppy.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is not a reserved identifier in non-strict mode code and may be
+      used as a label.
+  es6id: 12.1.1
+  flags: [noStrict]
+ ---*/
+
+yield: 1;

test/language/identifiers/yield-as-label-in-strict.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a reserved identifier in strict mode code and may not be used
+      as a label.
+  es6id: 12.1.1
+  negative: SyntaxError
+  flags: [onlyStrict]
+ ---*/
+
+yield: 1;

test/language/statements/generators/no-yield.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      Generators declared with GeneratorDeclaration syntax do not require a
+      `yield` expression.
+  es6id: 14.4
+ ---*/
+
+function *foo(a) {}
+
+var g = foo(3);
+
+assert.sameValue(g.next().value, undefined);
+assert.sameValue(g.next().done, true);

test/language/statements/generators/return.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `return` is a valid statement within generator function bodies.
+  es6id: 14.4
+ ---*/
+
+function* g() { return; }
+function* g() { return 1; }

test/language/statements/generators/yield-as-binding-identifier.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a reserved keyword within generator function bodies and may
+      not be used as a binding identifier.
+  es6id: 12.1.1
+  negative: SyntaxError
+ ---*/
+
+function* g() {
+  yield = 1;
+}

test/language/statements/generators/yield-as-expression-with-rhs.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a valid expression within generator function bodies.
+  es6id: 14.4
+ ---*/
+
+function* g() { (yield 1) }
+function* g() { [yield 1] }
+function* g() { {yield 1} }
+function* g() { yield 1, yield 1; }
+function* g() { (yield 1) ? yield 1 : yield 1 }

test/language/statements/generators/yield-as-expression-without-rhs.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a valid expression within generator function bodies.
+  es6id: 14.4
+ ---*/
+
+function* g() { (yield) }
+function* g() { [yield] }
+function* g() { {yield} }
+function* g() { yield, yield; }
+function* g() { (yield) ? yield : yield }

test/language/statements/generators/yield-as-function-expression-binding-identifier.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` may be used as the binding identifier of a function expression
+      within generator bodies.
+  es6id: 14.1
+  flags: [noStrict]
+ ---*/
+
+function* g() {
+  (function yield() {})
+}

test/language/statements/generators/yield-as-generator-declaration-binding-identifier.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a valid BindingIdentifier for GeneratorDeclarations outside of
+      strict mode.
+  es6id: 12.1.1
+  flags: [noStrict]
+ ---*/
+
+function* yield() { (yield 3) + (yield 4); }

test/language/statements/generators/yield-as-identifier-in-nested-function.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is not a reserved keyword within normal function bodies declared
+      within generator function bodies.
+  es6id: 12.1.1
+  flags: [noStrict]
+ ---*/
+
+function* g() {
+  function h() {
+    yield = 1;
+  }
+}

test/language/statements/generators/yield-as-label.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a reserved keyword within generator function bodies and may
+      not be used as a label.
+  es6id: 12.1.1
+  negative: SyntaxError
+ ---*/
+
+function* g() {
+  yield: 1;
+}

test/language/statements/generators/yield-as-literal-property-name.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` may be used as a literal property name in an object literal
+      within generator function bodies.
+  es6id: 12.1.1
+ ---*/
+
+function* g() {
+  ({ get yield() { return 1 } });
+}

test/language/statements/generators/yield-as-logical-or-expression.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` expressions are not LogicalOrExpressions.
+  es6id: 12.1.1
+  negative: SyntaxError
+ ---*/
+
+
+function* g() {
+  yield ? yield : yield
+}

test/language/statements/generators/yield-as-parameter.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a reserved keyword within generator function bodies and may
+      not be used as the binding identifier of a parameter.
+  es6id: 12.1.1
+  negative: SyntaxError
+ ---*/
+
+function* g(yield) {}

test/language/statements/generators/yield-as-property-name.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` may be used as a literal property name in an object literal
+      within generator function bodies.
+  es6id: 12.1.1
+ ---*/
+
+function* g() {
+  ({  yield: 1 });
+}

test/language/statements/generators/yield-as-statement.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` is a valid statement within generator function bodies.
+  es6id: 14.4
+ ---*/
+
+function* g() { yield; }
+function* g() { yield 1; }

test/language/statements/generators/yield-as-yield-operand.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      `yield` expressions may be used as the right-hand-side of other `yield`
+      expressions.
+  es6id: 14.4
+ ---*/
+
+function* g() {
+  yield yield 1;
+}

test/language/statements/generators/yield-newline.js

+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+  description: >
+      Newlines terminate `yield` expressions.
+  es6id: 14.4
+ ---*/
+
+function* g() {
+  yield
+  1
+}
+
+assert.sameValue(g().next().value, undefined);