mirror of https://github.com/tc39/test262.git
40 lines
1.5 KiB
JavaScript
40 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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esid: sec-for-statement-runtime-semantics-labelledevaluation
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description: Removal of lexical environment for the statement "head"
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info: |
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[...]
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2. Let loopEnv be NewDeclarativeEnvironment(oldEnv).
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3. Let loopEnvRec be loopEnv's EnvironmentRecord.
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4. Let isConst be the result of performing IsConstantDeclaration of
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LexicalDeclaration.
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5. Let boundNames be the BoundNames of LexicalDeclaration.
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6. For each element dn of boundNames do
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a. If isConst is true, then
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i. Perform ! loopEnvRec.CreateImmutableBinding(dn, true).
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b. Else,
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i. Perform ! loopEnvRec.CreateMutableBinding(dn, false).
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7. Set the running execution context's LexicalEnvironment to loopEnv.
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[...]
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12. Set the running execution context's LexicalEnvironment to oldEnv.
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13. Return Completion(bodyResult).
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features: [let]
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---*/
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let x = 'outside';
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var run = true;
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var probeTest, probeIncr, probeBody;
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for (
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let x = 'inside';
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(probeTest = function() { return x; }) && run;
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probeIncr = function() { return x; }
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)
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probeBody = function() { return x; }, run = false;
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assert.sameValue(probeBody(), 'inside', 'reference from statement body');
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assert.sameValue(probeIncr(), 'inside', 'reference from "increment" position');
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assert.sameValue(probeTest(), 'inside', 'reference from "test" position');
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assert.sameValue(x, 'outside');
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