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// Copyright (c) 2017, 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.
// @dart = 2.9
// The identifiers listed below are mentioned in the grammar, but none of
// them is a reserved word or a built-in identifier. Such an identifier can
// be used just like all other identifiers, with the exceptions mentioned
// below. Here are said 'known' identifiers:
//
// `async`, `await`, `hide`, `of`, `on`, `show`, `sync`, `yield`
//
// The following exceptions apply:
//
// It is a compile-time error to use `await` or `yield` as an identifier in
// the body of a function marked `async`, `async*`, or `sync*`.
//
// It is a compile-time error if an asynchronous for-in appears inside a
// synchronous function.
import 'dart:async';
Future<int> f1() async {
// Allowed:
int async = 1;
int await = 1;
// ^^^^^
// [analyzer] SYNTACTIC_ERROR.ASYNC_KEYWORD_USED_AS_IDENTIFIER
// [cfe] 'await' can't be used as an identifier in 'async', 'async*', or 'sync*' methods.
int yield = 1;
// ^^^^^
// [analyzer] SYNTACTIC_ERROR.ASYNC_KEYWORD_USED_AS_IDENTIFIER
// [cfe] 'yield' can't be used as an identifier in 'async', 'async*', or 'sync*' methods.
Stream<int> s = new Stream<int>.fromFuture(new Future<int>.value(1));
await for (int i in s) {
return i + 1;
}
}
Stream<int> f2() async* {
int async = 1;
int await = 1;
// ^^^^^
// [analyzer] SYNTACTIC_ERROR.ASYNC_KEYWORD_USED_AS_IDENTIFIER
// [cfe] 'await' can't be used as an identifier in 'async', 'async*', or 'sync*' methods.
int yield = 1;
// ^^^^^
// [analyzer] SYNTACTIC_ERROR.ASYNC_KEYWORD_USED_AS_IDENTIFIER
// [cfe] 'yield' can't be used as an identifier in 'async', 'async*', or 'sync*' methods.
Stream<int> s = new Stream<int>.fromFuture(new Future<int>.value(1));
await for (var i in s) {
yield i + 1;
}
}
Iterable<int> f3() sync* {
int async = 1;
int await = 1;
// ^^^^^
// [analyzer] SYNTACTIC_ERROR.ASYNC_KEYWORD_USED_AS_IDENTIFIER
// [cfe] 'await' can't be used as an identifier in 'async', 'async*', or 'sync*' methods.
int yield = 1;
// ^^^^^
// [analyzer] SYNTACTIC_ERROR.ASYNC_KEYWORD_USED_AS_IDENTIFIER
// [cfe] 'yield' can't be used as an identifier in 'async', 'async*', or 'sync*' methods.
Stream<int> s = new Stream<int>.fromFuture(new Future<int>.value(1));
await for (int i in s) {
// ^^
// [analyzer] COMPILE_TIME_ERROR.ASYNC_FOR_IN_WRONG_CONTEXT
// [cfe] The asynchronous for-in can only be used in functions marked with 'async' or 'async*'.
yield i + 1;
}
}
int f4() {
int async = 1;
int await = 1;
int yield = 1;
Stream s = new Stream<int>.fromFuture(new Future<int>.value(1));
await for (int i in s) {
// ^^
// [analyzer] COMPILE_TIME_ERROR.ASYNC_FOR_IN_WRONG_CONTEXT
// [cfe] The asynchronous for-in can only be used in functions marked with 'async' or 'async*'.
return i + 1;
}
}
main() {
Future<int> f = f1();
Stream s = f2();
Iterable<int> i = f3();
int x = f4();
}