mirror of
https://github.com/tc39/test262.git
synced 2025-11-03 21:24:30 +01:00
86 lines
2.6 KiB
JavaScript
86 lines
2.6 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
|
|
// This code is governed by the BSD license found in the LICENSE file.
|
|
/*---
|
|
description: Referencing the arguments object from a default parameter (method)
|
|
esid: sec-runtime-semantics-definemethod
|
|
es6id: 14.3.8
|
|
features: [default-parameters]
|
|
info: |
|
|
MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody }
|
|
|
|
[...]
|
|
6. Let closure be FunctionCreate(kind, StrictFormalParameters,
|
|
FunctionBody, scope, strict). If functionPrototype was passed as a
|
|
parameter then pass its value as the functionPrototype optional argument
|
|
of FunctionCreate.
|
|
[...]
|
|
|
|
9.2.1 [[Call]] ( thisArgument, argumentsList)
|
|
|
|
[...]
|
|
7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
|
|
[...]
|
|
|
|
9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
|
|
|
|
1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
|
|
[...]
|
|
|
|
9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
|
|
|
|
[...]
|
|
23. Let iteratorRecord be Record {[[iterator]]:
|
|
CreateListIterator(argumentsList), [[done]]: false}.
|
|
24. If hasDuplicates is true, then
|
|
[...]
|
|
25. Else,
|
|
b. Let formalStatus be IteratorBindingInitialization for formals with
|
|
iteratorRecord and env as arguments.
|
|
[...]
|
|
|
|
14.1.19 Runtime Semantics: IteratorBindingInitialization
|
|
|
|
FormalsList : FormalsList , FormalParameter
|
|
|
|
1. Let status be the result of performing IteratorBindingInitialization for
|
|
FormalsList using iteratorRecord and environment as the arguments.
|
|
2. ReturnIfAbrupt(status).
|
|
3. Return the result of performing IteratorBindingInitialization for
|
|
FormalParameter using iteratorRecord and environment as the arguments.
|
|
---*/
|
|
|
|
var callCount = 0;
|
|
var obj = {
|
|
method(x, _ = 0) {
|
|
assert.sameValue(x, undefined, 'parameter binding value (initial)');
|
|
assert.sameValue(
|
|
arguments[0], undefined, 'arguments property value (initial)'
|
|
);
|
|
|
|
arguments[0] = 1;
|
|
|
|
assert.sameValue(
|
|
x, undefined, 'parameter binding value (after arguments modification)'
|
|
);
|
|
assert.sameValue(
|
|
arguments[0], 1, 'arguments property value (after arguments modification)'
|
|
);
|
|
|
|
x = 2;
|
|
|
|
assert.sameValue(
|
|
x, 2, 'parameter binding value (after parameter binding modification)'
|
|
);
|
|
assert.sameValue(
|
|
arguments[0],
|
|
1,
|
|
'arguments property value (after parameter binding modification)'
|
|
);
|
|
callCount = callCount + 1;
|
|
}
|
|
};
|
|
|
|
obj.method();
|
|
|
|
assert.sameValue(callCount, 1, 'method invoked exactly once');
|