library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/regress/issue_37681.dart:6:7: Error: Functions marked 'async' must have a return type assignable to 'Future'.
//   int f_async() async { return 42; }
//       ^^^^^^^
//
// pkg/front_end/testcases/regress/issue_37681.dart:9:7: Error: Functions marked 'async*' must have a return type assignable to 'Stream'.
//   int f_async_star() async* { yield 42; }
//       ^^^^^^^^^^^^
//
// pkg/front_end/testcases/regress/issue_37681.dart:14:7: Error: Functions marked 'sync*' must have a return type assignable to 'Iterable'.
//   int f_sync_star() sync* { yield 42; }
//       ^^^^^^^^^^^
//
import self as self;
import "dart:core" as core;
import "dart:async" as asy;

static method main() → dynamic async /* futureValueType= dynamic */ {
  function f_async() → core::int async /* futureValueType= core::Object? */ {
    return 42;
  }
  core::print(await f_async(){() → core::int});
  function f_async_star() → core::int async* {
    yield 42;
  }
  await for (dynamic x in (f_async_star(){() → core::int} as{ForNonNullableByDefault} dynamic) as{TypeError,ForDynamic,ForNonNullableByDefault} asy::Stream<dynamic>) {
    core::print(x);
  }
  function f_sync_star() → core::int sync* {
    yield 42;
  }
  for (dynamic x in (f_sync_star(){() → core::int} as{ForNonNullableByDefault} dynamic) as{TypeError,ForDynamic,ForNonNullableByDefault} core::Iterable<dynamic>) {
    core::print(x);
  }
}