mirror of https://github.com/tc39/test262.git
51 lines
1.5 KiB
JavaScript
51 lines
1.5 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-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
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description: >
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Creation of new lexical environment for each evaluation of the statement
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body
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info: |
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IterationStatement : for ( ForDeclaration of AssignmentExpression ) Statement
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[...]
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2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
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lexicalBinding, labelSet).
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13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
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[...]
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5. Repeat
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[...]
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i. Let result be the result of evaluating stmt.
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j. Set the running execution context's LexicalEnvironment to oldEnv.
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k. If LoopContinues(result, labelSet) is false, return ?
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IteratorClose(iterator, UpdateEmpty(result, V)).
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l. If result.[[Value]] is not empty, let V be result.[[Value]].
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features: [let]
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---*/
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let x = 'outside';
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var probeFirst, probeSecond;
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for (let x in { a: 0, b: 0 })
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if (!probeFirst)
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probeFirst = function() { return x; };
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else
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probeSecond = function() { return x; };
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// 13.7.5.15 EnumerateObjectProperties
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//
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// > [...] The mechanics and order of enumerating the properties is not
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// > specified [...]
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assert.notSameValue(probeFirst(), probeSecond());
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assert(
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probeFirst() === 'a' || probeFirst() === 'b',
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'First binding is either "a" or "b"'
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);
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assert(
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probeSecond() === 'a' || probeSecond() === 'b',
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'Second binding is either "a" or "b"'
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);
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