// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
desc: Destructuring initializer is not evaluated when value is not `undefined`
template: default
info: |
    13.3.3.7 Runtime Semantics: KeyedBindingInitialization

    BindingElement : BindingPattern Initializeropt

    [...]
    3. If Initializer is present and v is undefined, then
    [...]
---*/

//- setup
var initCount = 0;
function counter() {
  initCount += 1;
}
//- elems
{ s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() }
//- vals
{ s: null, u: 0, w: false, y: '' }
//- body
assert.sameValue(t, null);
assert.sameValue(v, 0);
assert.sameValue(x, false);
assert.sameValue(z, '');
assert.sameValue(initCount, 0);

assert.throws(ReferenceError, function() {
  s;
});
assert.throws(ReferenceError, function() {
  u;
});
assert.throws(ReferenceError, function() {
  w;
});
assert.throws(ReferenceError, function() {
  y;
});