test262/test/language/expressions/object/dstr/async-gen-meth-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/async-gen-meth.template
/*---
description: BindingElement with array binding pattern and initializer is not used (async generator method)
esid: sec-asyncgenerator-definitions-propertydefinitionevaluation
features: [async-iteration]
flags: [generated, async]
info: |
    AsyncGeneratorMethod :
        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
            { AsyncGeneratorBody }

    1. Let propKey be the result of evaluating PropertyName.
    2. ReturnIfAbrupt(propKey).
    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
       Otherwise let strict be false.
    4. Let scope be the running execution context's LexicalEnvironment.
    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
       AsyncGeneratorBody, scope, strict).
    [...]


    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 obj = {
  async *method([[...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;
  }
};

obj.method([values]).next().then(() => {
    assert.sameValue(callCount, 1, 'invoked exactly once');
}).then($DONE, $DONE);