JSTests/test262/test/language/statements/async-generator/dstr/ary-ptrn-elem-id-iter-val-array-prototype.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-elem-id-iter-val-array-prototype.case
// - src/dstr-binding/default/async-gen-func-decl.template
/*---
description: Array destructuring uses overriden Array.prototype[Symbol.iterator] (async generator function declaration)
esid: sec-asyncgenerator-definitions-instantiatefunctionobject
features: [Symbol.iterator, generators, async-iteration]
flags: [generated, async]
info: |
    AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier
        ( FormalParameters ) { AsyncGeneratorBody }

        [...]
        3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody,
            scope, strict).
        [...]


    Runtime Semantics: IteratorBindingInitialization

    SingleNameBinding : BindingIdentifier Initializer_opt

    1. Let bindingId be StringValue of BindingIdentifier.
    2. Let lhs be ? ResolveBinding(bindingId, environment).
    3. If iteratorRecord.[[Done]] is false, then
        a. Let next be IteratorStep(iteratorRecord).
        b. If next is an abrupt completion, set iteratorRecord.[[Done]] to true.
        c. ReturnIfAbrupt(next).
        d. If next is false, set iteratorRecord.[[Done]] to true.
        e. Else,
            i. Let v be IteratorValue(next).
            ii. If v is an abrupt completion, set iteratorRecord.[[Done]] to true.
            iii. ReturnIfAbrupt(v).
    [...]
    7. Return InitializeReferencedBinding(lhs, v).

---*/
Array.prototype[Symbol.iterator] = function* () {
    if (this.length > 0) {
        yield this[0];
    }
    if (this.length > 1) {
        yield this[1];
    }
    if (this.length > 2) {
        yield 42;
    }
};


var callCount = 0;
async function* f([x, y, z]) {
  assert.sameValue(x, 1);
  assert.sameValue(y, 2);
  assert.sameValue(z, 42);
  callCount = callCount + 1;
};
f([1, 2, 3]).next().then(() => {
    assert.sameValue(callCount, 1, 'invoked exactly once');
}).then($DONE, $DONE);