library test;
import self as self;
import "dart:async" as asy;
import "dart:core" as core;
import "dart:_internal" as _in;

import "dart:async";

static method main() → dynamic /* originally async */ {
  final asy::_Future<dynamic>* :async_future = new asy::_Future::•<dynamic>();
  core::bool* :is_sync = false;
  FutureOr<dynamic>* :return_value;
  (dynamic) →* dynamic :async_op_then;
  (core::Object*, core::StackTrace*) →* dynamic :async_op_error;
  core::int* :await_jump_var = 0;
  dynamic :await_ctx_var;
  dynamic :saved_try_context_var0;
  function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
    try {
      #L1:
      {
        () →* asy::Stream<Null>* f = () → asy::Stream<Null>* /* originally async* */ {
          asy::_AsyncStarStreamController<Null>* :controller;
          dynamic :controller_stream;
          (dynamic) →* dynamic :async_op_then;
          (core::Object*, core::StackTrace*) →* dynamic :async_op_error;
          core::int* :await_jump_var = 0;
          dynamic :await_ctx_var;
          dynamic :saved_try_context_var0;
          dynamic :saved_try_context_var1;
          function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
            try
              try {
                #L2:
                {
                  if(:controller.{asy::_AsyncStarStreamController::add}(null))
                    return null;
                  else
                    [yield] null;
                }
                return;
              }
              on dynamic catch(dynamic exception, core::StackTrace* stack_trace) {
                :controller.{asy::_AsyncStarStreamController::addError}(exception, stack_trace);
              }
            finally {
              :controller.{asy::_AsyncStarStreamController::close}();
            }
          :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
          :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
          :controller = new asy::_AsyncStarStreamController::•<Null>(:async_op);
          :controller_stream = :controller.{asy::_AsyncStarStreamController::stream};
          return :controller_stream;
        };
        asy::Stream<dynamic>* y = f(){() →* asy::Stream<Null>*};
        asy::Stream<core::String*>* z = f(){() →* asy::Stream<Null>*};
        [yield] let dynamic #t1 = asy::_awaitHelper(f(){() →* asy::Stream<Null>*}.{asy::Stream::first}{asy::Future<Null>*}, :async_op_then, :async_op_error, :async_op) in null;
        core::String* s = _in::unsafeCast<Null>(:result);
      }
      asy::_completeOnAsyncReturn(:async_future, :return_value, :is_sync);
      return;
    }
    on dynamic catch(dynamic exception, core::StackTrace* stack_trace) {
      asy::_completeOnAsyncError(:async_future, exception, stack_trace, :is_sync);
    }
  :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
  :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
  :async_op.call();
  :is_sync = true;
  return :async_future;
}