JSTests/test262/test/language/expressions/async-generator/dstr/dflt-ary-ptrn-rest-id-iter-step-err.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-rest-id-iter-step-err.case
// - src/dstr-binding/error/async-gen-func-expr-dflt.template
/*---
description: Error forwarding when IteratorStep returns an abrupt completion (async generator function expression (default parameter))
esid: sec-asyncgenerator-definitions-evaluation
features: [generators, async-iteration]
flags: [generated]
info: |
    AsyncGeneratorExpression : async [no LineTerminator here] function * ( FormalParameters ) {
        AsyncGeneratorBody }

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

    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
    BindingRestElement : ... BindingIdentifier
    1. Let lhs be ResolveBinding(StringValue of BindingIdentifier,
       environment).
    2. ReturnIfAbrupt(lhs). 3. Let A be ArrayCreate(0). 4. Let n=0. 5. Repeat,
       a. If iteratorRecord.[[done]] is false,
          i. Let next be IteratorStep(iteratorRecord.[[iterator]]).
          ii. If next is an abrupt completion, set iteratorRecord.[[done]] to
              true.
          iii. ReturnIfAbrupt(next).

---*/
var first = 0;
var second = 0;
var iter = function*() {
  first += 1;
  throw new Test262Error();
  second += 1;
}();


var f = async function*([...x] = iter) {
  
};

assert.throws(Test262Error, function() {
  f();
});

iter.next();
assert.sameValue(first, 1);
assert.sameValue(second, 0, 'Iterator is closed following abrupt completion.');