JSTests/test262/test/language/expressions/function/dstr/dflt-ary-ptrn-rest-obj-prop-id.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-rest-obj-prop-id.case
// - src/dstr-binding/default/func-expr-dflt.template
/*---
description: Rest element containing an object binding pattern (function expression (default parameter))
esid: sec-function-definitions-runtime-semantics-evaluation
es6id: 14.1.20
features: [destructuring-binding, default-parameters]
flags: [generated]
info: |
    FunctionExpression : function ( FormalParameters ) { FunctionBody }

        [...]
        3. Let closure be FunctionCreate(Normal, FormalParameters, FunctionBody,
           scope, strict).
        [...]

    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.
    [...]

    13.3.3.6 Runtime Semantics: IteratorBindingInitialization

    BindingRestElement : ... BindingPattern

    1. Let A be ArrayCreate(0).
    [...]
    3. Repeat
       [...]
       b. If iteratorRecord.[[done]] is true, then
          i. Return the result of performing BindingInitialization of
             BindingPattern with A and environment as the arguments.
       [...]
---*/
let length = "outer";

var callCount = 0;
var f;
f = function([...{ 0: v, 1: w, 2: x, 3: y, length: z }] = [7, 8, 9]) {
  assert.sameValue(v, 7);
  assert.sameValue(w, 8);
  assert.sameValue(x, 9);
  assert.sameValue(y, undefined);
  assert.sameValue(z, 3);

  assert.sameValue(length, "outer", "the length prop is not set as a binding name");
  callCount = callCount + 1;
};

f();
assert.sameValue(callCount, 1, 'function invoked exactly once');