src/annex-b-fns/func-init.case


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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
desc: Variable binding is initialized to `undefined` in outer scope
template: func
info: |
    B.3.3.1 Changes to FunctionDeclarationInstantiation

    [...]
    2. If instantiatedVarNames does not contain F, then
       a. Perform ! varEnvRec.CreateMutableBinding(F, false).
       b. Perform varEnvRec.InitializeBinding(F, undefined).
       c. Append F to instantiatedVarNames.
    [...]
---*/

//- setup
var init, changed;
//- before
init = f;
f = 123;
changed = f;
//- teardown
assert.sameValue(init, undefined, 'binding is initialized to `undefined`');
assert.sameValue(changed, 123, 'binding is mutable');
assert.throws(ReferenceError, function() {
  f;
}, 'global binding is not created');