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

static method main() → dynamic {
  dynamic result = self::returnsString();
  core::print(result.runtimeType);
}
static method returnsString() → asy::FutureOr<core::String> /* originally async */ {
  final asy::Completer<core::String> :async_completer = asy::Completer::sync<core::String>();
  asy::FutureOr<core::String> :return_value;
  dynamic :async_stack_trace;
  dynamic :async_op_then;
  dynamic :async_op_error;
  dynamic :await_jump_var = 0;
  dynamic :await_ctx_var;
  function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
    try {
      #L1:
      {
        :return_value = "oh no";
        break #L1;
      }
      :async_completer.{asy::Completer::complete}(:return_value);
      return;
    }
    on dynamic catch(dynamic :exception, dynamic :stack_trace) {
      :async_completer.{asy::Completer::completeError}(:exception, :stack_trace);
    }
  :async_stack_trace = asy::_asyncStackTraceHelper(:async_op);
  :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
  :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
  asy::Future::microtask<dynamic>(:async_op);
  return :async_completer.{asy::Completer::future};
}