| // Copyright (C) 2018 Valerie Young. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-%asyncfromsynciteratorprototype%.throw |
| description: throw() will call default sync throw |
| info: | |
| %AsyncFromSyncIteratorPrototype%.throw ( value ) |
| ... |
| 2. Let promiseCapability be ! NewPromiseCapability(%Promise%). |
| ... |
| 5. Let throw be GetMethod(syncIterator, "throw"). |
| ... |
| 8. Let throwResult be Call(throw, syncIterator, « value ») |
| 9. IfAbruptRejectPromise(throwResult, promiseCapability). |
| ... |
| 22. Return promiseCapability.[[Promise]]. |
| |
| Generator.prototype.throw ( exception ) |
| 1. Let g be the this value. |
| 2. Let C be Completion{[[Type]]: throw, [[Value]]: exception, [[Target]]: empty}. |
| 3. Return ? GeneratorResumeAbrupt(g, C). |
| |
| flags: [async] |
| features: [async-iteration] |
| ---*/ |
| |
| var thrownError = new Error("Catch me.") |
| |
| function* g() { |
| yield 42; |
| throw new Test262Error('throw closes iter'); |
| yield 43; |
| } |
| |
| async function* asyncg() { |
| yield* g(); |
| } |
| |
| var iter = asyncg(); |
| |
| iter.next().then(function(result) { |
| |
| // throw will call sync generator prototype built-in function throw |
| iter.throw(thrownError).then( |
| function(result) { |
| throw new Test262Error('throw should cause rejection of promise'); |
| }, |
| function(err) { |
| assert.sameValue(err, thrownError, "promise should be reject with custom error, got: " + err) |
| |
| iter.next().then(({ done, value }) => { |
| assert.sameValue(done, true, 'the iterator is completed'); |
| assert.sameValue(value, undefined, 'value is undefined'); |
| }).then($DONE, $DONE); |
| } |
| ).catch($DONE); |
| |
| }).catch($DONE); |