library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;
import "dart:async" as asy;
import "dart:_internal" as _in;

abstract class TestMixin<R extends core::Object? = dynamic, T extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
  method test(generic-covariant-impl asy::Future<self::TestMixin::R%> fetch) → asy::Future<self::TestMixin::T%> /* originally async */ {
    final asy::_AsyncAwaitCompleter<self::TestMixin::T%> :async_completer = new asy::_AsyncAwaitCompleter::•<self::TestMixin::T%>();
    FutureOr<self::TestMixin::T%>? :return_value;
    dynamic :async_stack_trace;
    (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:
        {
          [yield] let dynamic #t1 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
          final self::TestMixin::R% response = _in::unsafeCast<self::TestMixin::R%>(:result);
          self::TestMixin::T% result;
          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
            result = response{self::TestMixin::R% & self::Response<dynamic> /* '%' & '!' = '!' */}.{self::Response::data} as{TypeError,ForDynamic,ForNonNullableByDefault} self::TestMixin::T%;
          }
          else
            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
              result = response{self::TestMixin::R% & self::PagingResponse<dynamic> /* '%' & '!' = '!' */}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} self::TestMixin::T%;
            }
            else
              if(response is{ForNonNullableByDefault} self::TestMixin::T%) {
                result = response{self::TestMixin::R% & self::TestMixin::T% /* '%' & '%' = '%' */};
              }
              else {
                throw core::Exception::•("Invalid response type");
              }
          :return_value = result;
          break #L1;
        }
        asy::_completeOnAsyncReturn(:async_completer, :return_value);
        return;
      }
      on dynamic catch(dynamic exception, core::StackTrace 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);
    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
    return :async_completer.{asy::Completer::future};
  }
}
class PagingResponse<T extends core::Object? = dynamic> extends core::Object {
  final field self::PagingResponseData<self::PagingResponse::T%> data;
  constructor •(self::PagingResponseData<self::PagingResponse::T%> data) → self::PagingResponse<self::PagingResponse::T%>
    : self::PagingResponse::data = data, super core::Object::•()
    ;
}
class PagingResponseData<T extends core::Object? = dynamic> extends core::Object {
  final field core::List<self::PagingResponseData::T%> data;
  constructor •(core::List<self::PagingResponseData::T%> data) → self::PagingResponseData<self::PagingResponseData::T%>
    : self::PagingResponseData::data = data, super core::Object::•()
    ;
}
class Response<T extends core::Object? = dynamic> extends core::Object {
  final field self::Response::T% data;
  constructor •(self::Response::T% data) → self::Response<self::Response::T%>
    : self::Response::data = data, super core::Object::•()
    ;
}
abstract class _Class1&Object&TestMixin extends core::Object implements self::TestMixin<self::Response<core::String>, core::String> /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  {
  const synthetic constructor •() → self::_Class1&Object&TestMixin
    : super core::Object::•()
    ;
  method test(generic-covariant-impl asy::Future<self::Response<core::String>> fetch) → asy::Future<core::String> /* originally async */ {
    final asy::_AsyncAwaitCompleter<core::String> :async_completer = new asy::_AsyncAwaitCompleter::•<core::String>();
    FutureOr<core::String>? :return_value;
    dynamic :async_stack_trace;
    (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 {
        #L2:
        {
          [yield] let dynamic #t2 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
          final self::Response<core::String> response = _in::unsafeCast<self::Response<core::String>>(:result);
          core::String result;
          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
            result = response{self::Response<core::String>}.{self::Response::data};
          }
          else
            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
              result = response{self::Response<core::String>}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} core::String;
            }
            else
              if(response is{ForNonNullableByDefault} core::String) {
                result = response{self::Response<core::String>};
              }
              else {
                throw core::Exception::•("Invalid response type");
              }
          :return_value = result;
          break #L2;
        }
        asy::_completeOnAsyncReturn(:async_completer, :return_value);
        return;
      }
      on dynamic catch(dynamic exception, core::StackTrace 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);
    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
    return :async_completer.{asy::Completer::future};
  }
}
class Class1 extends self::_Class1&Object&TestMixin {
  synthetic constructor •() → self::Class1
    : super self::_Class1&Object&TestMixin::•()
    ;
  method _test() → dynamic {
    final self::Response<core::String> response = new self::Response::•<core::String>("test");
    this.{self::TestMixin::test}(asy::Future::value<self::Response<core::String>>(response));
  }
}
abstract class _Class2&Object&TestMixin extends core::Object implements self::TestMixin<self::PagingResponse<core::String>, core::String> /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  {
  const synthetic constructor •() → self::_Class2&Object&TestMixin
    : super core::Object::•()
    ;
  method test(generic-covariant-impl asy::Future<self::PagingResponse<core::String>> fetch) → asy::Future<core::String> /* originally async */ {
    final asy::_AsyncAwaitCompleter<core::String> :async_completer = new asy::_AsyncAwaitCompleter::•<core::String>();
    FutureOr<core::String>? :return_value;
    dynamic :async_stack_trace;
    (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 {
        #L3:
        {
          [yield] let dynamic #t3 = asy::_awaitHelper(fetch, :async_op_then, :async_op_error, :async_op) in null;
          final self::PagingResponse<core::String> response = _in::unsafeCast<self::PagingResponse<core::String>>(:result);
          core::String result;
          if(response is{ForNonNullableByDefault} self::Response<dynamic>) {
            result = response{self::PagingResponse<core::String>}.{self::Response::data} as{TypeError,ForDynamic,ForNonNullableByDefault} core::String;
          }
          else
            if(response is{ForNonNullableByDefault} self::PagingResponse<dynamic>) {
              result = response{self::PagingResponse<core::String>}.{self::PagingResponse::data}.{self::PagingResponseData::data} as{ForNonNullableByDefault} core::String;
            }
            else
              if(response is{ForNonNullableByDefault} core::String) {
                result = response{self::PagingResponse<core::String>};
              }
              else {
                throw core::Exception::•("Invalid response type");
              }
          :return_value = result;
          break #L3;
        }
        asy::_completeOnAsyncReturn(:async_completer, :return_value);
        return;
      }
      on dynamic catch(dynamic exception, core::StackTrace 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);
    :async_completer.{asy::_AsyncAwaitCompleter::start}(:async_op);
    return :async_completer.{asy::Completer::future};
  }
}
class Class2 extends self::_Class2&Object&TestMixin {
  synthetic constructor •() → self::Class2
    : super self::_Class2&Object&TestMixin::•()
    ;
  method _test() → dynamic {
    final self::PagingResponse<core::String> response = new self::PagingResponse::•<core::String>(new self::PagingResponseData::•<core::String>(<core::String>["test"]));
    this.{self::TestMixin::test}(asy::Future::value<self::PagingResponse<core::String>>(response));
  }
}
static method main() → dynamic {}