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33 lines
1.4 KiB
JavaScript
33 lines
1.4 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-switch-statement-runtime-semantics-evaluation
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description: Retainment of existing variable environment (`case` clause)
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info: |
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1. Let exprRef be the result of evaluating Expression.
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2. Let switchValue be ? GetValue(exprRef).
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3. Let oldEnv be the running execution context's LexicalEnvironment.
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4. Let blockEnv be NewDeclarativeEnvironment(oldEnv).
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5. Perform BlockDeclarationInstantiation(CaseBlock, blockEnv).
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6. Set the running execution context's LexicalEnvironment to blockEnv.
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7. Let R be the result of performing CaseBlockEvaluation of CaseBlock with
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argument switchValue.
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[...]
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flags: [noStrict]
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---*/
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var probeExpr, probeSelector, probeStmt;
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var probeBefore = function() { return x; };
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switch (eval('var x = 1;'), probeExpr = function() { return x; }, null) {
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case eval('var x = 2;'), probeSelector = function() { return x; }, null:
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probeStmt = function() { return x; };
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var x = 3;
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}
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assert.sameValue(probeBefore(), 3, 'reference preceding statement');
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assert.sameValue(probeExpr(), 3, 'reference from first Expression');
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assert.sameValue(probeSelector(), 3, 'reference from "selector" Expression');
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assert.sameValue(probeStmt(), 3, 'reference from Statement position');
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assert.sameValue(x, 3, 'reference following statement');
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