Erik Ernst
69790e7eb4
Change-Id: I9ba3aa4e3ebaedee3a2cd20ccdcc533af96b9bda Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98018 Reviewed-by: Lasse R.H. Nielsen <lrn@google.com> Commit-Queue: Erik Ernst <eernst@google.com>
36 lines
1013 B
Dart
36 lines
1013 B
Dart
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Test that various invalid uses of `yield` are disallowed.
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import "dart:async";
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import "package:expect/expect.dart";
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import "package:async_helper/async_helper.dart";
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var yield = 42;
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main() async {
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asyncStart();
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Stream<String> f() async* {
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// Invalid syntax.
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yield ("a", "b"); //# 01: syntax error
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yield yield "twice"; //# 02: syntax error
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// Valid but curious syntax.
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yield throw "throw"; //# 03: runtime error
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// Type error.
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yield* "one"; //# 04: compile-time error
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label: yield "ok";
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}
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var completer = Completer();
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f().listen(completer.complete, onError: completer.completeError,
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onDone: () {
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if (!completer.isCompleted) completer.completeError("not ok?");
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});
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Expect.equals("ok", await completer.future);
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asyncEnd();
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}
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