mirror of https://github.com/tc39/test262.git
39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
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// Copyright (C) 2015 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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es6id: 9.2.12
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description: >
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A variable initial value is undefined if its name is not in the
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parameters list.
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info: >
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9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
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...
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27. If hasParameterExpressions is false, then
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...
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28. Else,
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a. NOTE A separate Environment Record is needed to ensure that closures
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created by expressions in the formal parameter list do not have visibility
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of declarations in the function body.
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b. Let varEnv be NewDeclarativeEnvironment(env).
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c. Let varEnvRec be varEnv’s EnvironmentRecord.
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d. Set the VariableEnvironment of calleeContext to varEnv.
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e. Let instantiatedVarNames be a new empty List.
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f. For each n in varNames, do
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i. If n is not an element of instantiatedVarNames, then
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1. Append n to instantiatedVarNames.
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2. Let status be varEnvRec.CreateMutableBinding(n).
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3. Assert: status is never an abrupt completion.
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4. If n is not an element of parameterNames or if n is an element of
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functionNames, let initialValue be undefined.
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...
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---*/
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function fn(a = 1) {
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var b;
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return b;
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}
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assert.sameValue(fn(), undefined);
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