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50 lines
1.9 KiB
JavaScript
50 lines
1.9 KiB
JavaScript
// 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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esid: sec-evaldeclarationinstantiation
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es6id: 18.2.1.2
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description: >
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Global functions are not created if conflicting function declarations were
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detected.
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info: |
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Runtime Semantics: EvalDeclarationInstantiation( body, varEnv, lexEnv, strict)
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...
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8. For each d in varDeclarations, in reverse list order do
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a. If d is neither a VariableDeclaration or a ForBinding, then
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i. Assert: d is either a FunctionDeclaration or a GeneratorDeclaration.
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ii. NOTE If there are multiple FunctionDeclarations for the same name,
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the last declaration is used.
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iii. Let fn be the sole element of the BoundNames of d.
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iv. If fn is not an element of declaredFunctionNames, then
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1. If varEnvRec is a global Environment Record, then
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a. Let fnDefinable be varEnvRec.CanDeclareGlobalFunction(fn).
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b. ReturnIfAbrupt(fnDefinable).
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c. If fnDefinable is false, throw TypeError exception.
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...
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14. For each production f in functionsToInitialize, do
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a. Let fn be the sole element of the BoundNames of f.
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b. Let fo be the result of performing InstantiateFunctionObject for f with argument lexEnv.
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c. If varEnvRec is a global Environment Record, then
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i. Let status be varEnvRec.CreateGlobalFunctionBinding(fn, fo, true).
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ii. ReturnIfAbrupt(status).
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...
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---*/
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try {
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(0,eval)("function shouldNotBeDefined1() {} function NaN() {} function shouldNotBeDefined2() {}");
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} catch (e) {
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// Ignore TypeError exception.
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}
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assert.sameValue(
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Object.getOwnPropertyDescriptor(this, "shouldNotBeDefined1"),
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undefined,
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"declaration preceding"
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);
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assert.sameValue(
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Object.getOwnPropertyDescriptor(this, "shouldNotBeDefined2"),
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undefined,
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"declaration following"
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);
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