mirror of https://github.com/tc39/test262.git
49 lines
1.6 KiB
JavaScript
49 lines
1.6 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 the initial evaluation of the
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statement 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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d. If lhsKind is either assignment or varBinding, then
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[...]
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e. Else,
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i. Assert: lhsKind is lexicalBinding.
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ii. Assert: lhs is a ForDeclaration.
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iii. Let iterationEnv be NewDeclarativeEnvironment(oldEnv).
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iv. Perform BindingInstantiation for lhs passing iterationEnv as the
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argument.
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v. Set the running execution context's LexicalEnvironment to
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iterationEnv.
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[...]
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features: [let]
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---*/
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var probeBefore = function() { return x; };
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let x = 'outside';
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var probeExpr, probeDecl, probeBody;
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for (
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let [x, _ = probeDecl = function() { return x; }]
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in
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{ i: probeExpr = function() { typeof x; }}
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)
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probeBody = function() { return x; };
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assert.sameValue(probeBefore(), 'outside');
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assert.throws(ReferenceError, probeExpr);
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assert.sameValue(probeDecl(), 'i', 'reference from ForDeclaration');
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assert.sameValue(probeBody(), 'i', 'reference from statement body');
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