library;
import self as self;
import "dart:core" as core;
import "dart:async" as asy;

import "dart:async";

static method main() → dynamic {
  FutureOr<core::String*>* result = self::returnsString();
  core::print(result.{core::Object::runtimeType}{core::Type*});
}
static method returnsString() → FutureOr<core::String*>* /* originally async */ {
  final asy::_Future<core::String*>* :async_future = new asy::_Future::•<core::String*>();
  core::bool* :is_sync = false;
  core::String? :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;
  function :async_op(dynamic :result_or_exception, dynamic :stack_trace) → dynamic yielding 
    try {
      #L1:
      {
        :return_value = "oh no";
        break #L1;
      }
      asy::_completeWithNoFutureOnAsyncReturn(: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(null, null){() →* dynamic};
  :is_sync = true;
  return :async_future;
}