blob: 0c5199f557eca02eeea93d564b5aed2a6ce60345 [file] [log] [blame]
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// Test that various invalid uses of `yield` are disallowed.
import "dart:async";
import "package:expect/expect.dart";
import "package:async_helper/async_helper.dart";
var yield = 42;
main() async {
Stream<String> f() async* {
// Invalid syntax.
yield ("a", "b"); //# 01: syntax error
yield yield "twice"; //# 02: syntax error
// Valid but curious syntax.
yield throw "throw"; //# 03: runtime error
// Type error.
yield* "one"; //# 04: compile-time error
label: yield "ok";
var completer = Completer();
f().listen(completer.complete, onError: completer.completeError,
onDone: () {
if (!completer.isCompleted) completer.completeError("not ok?");
Expect.equals("ok", await completer.future);