JSTests/test262/test/language/expressions/arrow-function/dstr/ary-ptrn-elem-ary-rest-iter.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-elem-ary-rest-iter.case
// - src/dstr-binding/default/arrow-function.template
/*---
description: BindingElement with array binding pattern and initializer is not used (arrow function expression)
esid: sec-arrow-function-definitions-runtime-semantics-evaluation
features: [destructuring-binding]
flags: [generated]
info: |
    ArrowFunction : ArrowParameters => ConciseBody

    [...]
    4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, 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

    BindingElement : BindingPatternInitializer opt

    1. If iteratorRecord.[[done]] is false, then
       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
       [...]
       e. Else,
          i. Let v be IteratorValue(next).
          [...]
    4. Return the result of performing BindingInitialization of BindingPattern
       with v and environment as the arguments.
---*/
var values = [2, 1, 3];
var initCount = 0;

var callCount = 0;
var f;
f = ([[...x] = function() { initCount += 1; }()]) => {
  assert(Array.isArray(x));
  assert.sameValue(x[0], 2);
  assert.sameValue(x[1], 1);
  assert.sameValue(x[2], 3);
  assert.sameValue(x.length, 3);
  assert.notSameValue(x, values);
  assert.sameValue(initCount, 0);
  callCount = callCount + 1;
};

f([values]);
assert.sameValue(callCount, 1, 'arrow function invoked exactly once');