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19762b927a
Although the `for..in` statement allows Expressions to define the iterator, only an AssignmentExpression may occupy this position in the `for..of` statement.
27 lines
716 B
JavaScript
27 lines
716 B
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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description: Expression is allowed in head
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info: >
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IterationStatement : for ( ForDeclaration in Expression ) Statement
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1. Let keyResult be the result of performing
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ForIn/OfHeadEvaluation(BoundNames of ForDeclaration, Expression,
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enumerate).
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2. ReturnIfAbrupt(keyResult).
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3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
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lexicalBinding, labelSet).
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es6id: 13.7.5.11
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---*/
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var iterCount = 0;
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var x;
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for (x in null, { key: 0 }) {
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assert.sameValue(x, 'key');
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iterCount += 1;
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}
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assert.sameValue(iterCount, 1);
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