global-existing-var-update.case

// 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-scoped binding is updated following evaluation
template: global
info: |
    B.3.3.2 Changes to GlobalDeclarationInstantiation
    [...]
    c. When the FunctionDeclaration f is evaluated, perform the following steps
       in place of the FunctionDeclaration Evaluation algorithm provided in
       14.1.21:

       i. Let genv be the running execution context's VariableEnvironment.
       ii. Let genvRec be genv's EnvironmentRecord.
       ii. Let benv be the running execution context's LexicalEnvironment.
       iv. Let benvRec be benv's EnvironmentRecord.
       v. Let fobj be ! benvRec.GetBindingValue(F, false).
       vi. Perform ? genvRec.SetMutableBinding(F, fobj, false).
       vii. Return NormalCompletion(empty).
---*/

//- body
return 'function declaration';
//- teardown
assert.sameValue(typeof f, 'function');
assert.sameValue(f(), 'function declaration');

var f = 123;