JSTests/test262/test/language/expressions/generators/dstr/dflt-ary-ptrn-elem-ary-elem-iter.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-elem-ary-elem-iter.case
// - src/dstr-binding/default/gen-func-expr-dflt.template
/*---
description: BindingElement with array binding pattern and initializer is not used (generator function expression (default parameter))
esid: sec-generator-function-definitions-runtime-semantics-evaluation
features: [generators, destructuring-binding, default-parameters]
flags: [generated]
info: |
    GeneratorExpression : function * ( FormalParameters ) { GeneratorBody }

        [...]
        3. Let closure be GeneratorFunctionCreate(Normal, FormalParameters,
           GeneratorBody, 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 callCount = 0;
var f;
f = function*([[x, y, z] = [4, 5, 6]] = [[7, 8, 9]]) {
  assert.sameValue(x, 7);
  assert.sameValue(y, 8);
  assert.sameValue(z, 9);
  callCount = callCount + 1;
};

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