JSTests/test262/test/language/expressions/object/dstr/meth-obj-ptrn-prop-obj.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/obj-ptrn-prop-obj.case
// - src/dstr-binding/default/meth.template
/*---
description: Object binding pattern with "nested" object binding pattern not using initializer (method)
esid: sec-runtime-semantics-definemethod
features: [destructuring-binding]
flags: [generated]
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.
    [...]

    13.3.3.7 Runtime Semantics: KeyedBindingInitialization

    [...]
    3. If Initializer is present and v is undefined, then
       [...]
    4. Return the result of performing BindingInitialization for BindingPattern
       passing v and environment as arguments.
---*/

var callCount = 0;
var obj = {
  method({ w: { x, y, z } = { x: 4, y: 5, z: 6 } }) {
    assert.sameValue(x, undefined);
    assert.sameValue(y, undefined);
    assert.sameValue(z, 7);

    assert.throws(ReferenceError, function() {
      w;
    });
    callCount = callCount + 1;
  }
};

obj.method({ w: { x: undefined, z: 7 } });
assert.sameValue(callCount, 1, 'method invoked exactly once');