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;
  }
  {
    asy::Stream<dynamic> :stream = (f_async_star(){() → core::int} as{ForNonNullableByDefault} dynamic) as{TypeError,ForDynamic,ForNonNullableByDefault} asy::Stream<dynamic>;
    asy::_StreamIterator<dynamic>? :for-iterator = new asy::_StreamIterator::•<dynamic>(:stream);
    try
      while (let dynamic #t1 = asy::_asyncStarMoveNextHelper(:stream) in await :for-iterator.{asy::_StreamIterator::moveNext}(){() → asy::Future<core::bool>}) {
        dynamic x = :for-iterator.{asy::_StreamIterator::current}{dynamic};
        {
          core::print(x);
        }
      }
    finally
      if(!(:for-iterator.{asy::_StreamIterator::_subscription}{asy::StreamSubscription<dynamic>?} == null))
        await :for-iterator.{asy::_StreamIterator::cancel}(){() → asy::Future<dynamic>};
  }
  function f_sync_star() → core::int /* originally sync* */ {
    function :sync_op_gen() → (core::_SyncIterator<dynamic>?, dynamic, dynamic) → core::bool* {
      core::int :await_jump_var = 0;
      dynamic :await_ctx_var;
      function :sync_op(core::_SyncIterator<dynamic>? :iterator, dynamic :exception, dynamic :stack_trace) → core::bool* yielding {
        {
          {
            :iterator.{core::_SyncIterator::_current} = 42;
            [yield] true;
          }
        }
        return false;
      }
      return :sync_op;
    }
    return new core::_SyncIterable::•<dynamic>(:sync_op_gen);
  }
  {
    core::Iterator<dynamic> :sync-for-iterator = ((f_sync_star(){() → core::int} as{ForNonNullableByDefault} dynamic) as{TypeError,ForDynamic,ForNonNullableByDefault} core::Iterable<dynamic>).{core::Iterable::iterator}{core::Iterator<dynamic>};
    for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
      dynamic x = :sync-for-iterator.{core::Iterator::current}{dynamic};
      {
        core::print(x);
      }
    }
  }
}