mirror of https://github.com/tc39/test262.git
51 lines
1.2 KiB
JavaScript
51 lines
1.2 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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Expressions as parameter default values share the top level context only.
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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
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closures created by expressions in the formal parameter list do
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not have visibility 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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---*/
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var x = 42;
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function fn1(a = x) {
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return a;
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}
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assert.sameValue(fn1(), 42);
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function fn2(a = function() { return x; }) {
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var x = 1;
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return a();
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}
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assert.sameValue(fn2(), 42);
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function fn3(a = function() { var x = 0; }) {
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a();
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return x;
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}
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assert.sameValue(fn3(), 42);
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function fn4(a = y) {
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var y = 1;
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}
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// y is only defined on the inner scope of fn4
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assert.throws(ReferenceError, function() {
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fn4();
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});
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