mirror of https://github.com/tc39/test262.git
51 lines
1.5 KiB
JavaScript
51 lines
1.5 KiB
JavaScript
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// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: >
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Mutable bindings are initialized in the lexical environment record prior to
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execution for generator function declarations
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esid: sec-moduledeclarationinstantiation
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info: |
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[...]
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15. For each element d in varDeclarations do
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a. For each element dn of the BoundNames of d do
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i. If dn is not an element of declaredVarNames, then
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1. Perform ! envRec.CreateMutableBinding(dn, false).
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2. Call envRec.InitializeBinding(dn, undefined).
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3. Append dn to declaredVarNames.
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[...]
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includes: [fnGlobalObject.js]
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flags: [module]
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---*/
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var global = fnGlobalObject();
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assert.sameValue(
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typeof test262, 'function', 'generator function value is hoisted'
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);
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assert.sameValue(
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test262().next().value,
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'test262',
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'hoisted generator function value is correct'
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);
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assert.sameValue(
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Object.getOwnPropertyDescriptor(global, 'test262'), undefined
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);
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test262 = null;
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assert.sameValue(test262, null, 'binding is mutable');
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assert.sameValue(
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Object.getOwnPropertyDescriptor(global, 'test262'), undefined
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);
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function* test262() { return 'test262'; }
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assert.sameValue(
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test262, null, 'binding is not effected by evaluation of declaration'
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);
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assert.sameValue(
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Object.getOwnPropertyDescriptor(global, 'test262'),
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undefined,
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'global binding is not effected by evaluation of declaration'
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);
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