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

class MyFuture<T extends core::Object = dynamic> extends core::Object implements asy::Future<self::MyFuture::T> {
  constructor •() → self::MyFuture<self::MyFuture::T>
    : super core::Object::•() {}
  constructor value(self::MyFuture::T x) → self::MyFuture<self::MyFuture::T>
    : super core::Object::•() {}
  method noSuchMethod(core::Invocation invocation) → dynamic
    return null;
  method then<S extends core::Object = dynamic>((self::MyFuture::T) → asy::FutureOr<self::MyFuture::then::S> f, {core::Function onError = null}) → self::MyFuture<self::MyFuture::then::S>
    return null;
  no-such-method-forwarder method /* from org-dartlang-sdk:///sdk/lib/async/future.dart */ catchError(core::Function onError, {(core::Object) → core::bool test = null}) → asy::Future<self::MyFuture::T>
    return this.{self::MyFuture::noSuchMethod}(new core::_InvocationMirror::_withoutType("catchError", const <core::Type>[], core::List::unmodifiable<dynamic>(<dynamic>[onError]), core::Map::unmodifiable<core::Symbol, dynamic>(<core::Symbol, dynamic>{#test: test}), false)) as{TypeError} asy::Future<self::MyFuture::T>;
  no-such-method-forwarder method /* from org-dartlang-sdk:///sdk/lib/async/future.dart */ whenComplete(() → asy::FutureOr<dynamic> action) → asy::Future<self::MyFuture::T>
    return this.{self::MyFuture::noSuchMethod}(new core::_InvocationMirror::_withoutType("whenComplete", const <core::Type>[], core::List::unmodifiable<dynamic>(<dynamic>[action]), core::Map::unmodifiable<core::Symbol, dynamic>(const <core::Symbol, dynamic>{}), false)) as{TypeError} asy::Future<self::MyFuture::T>;
  no-such-method-forwarder method /* from org-dartlang-sdk:///sdk/lib/async/future.dart */ timeout(core::Duration timeLimit, {generic-covariant-impl () → asy::FutureOr<self::MyFuture::T> onTimeout = null}) → asy::Future<self::MyFuture::T>
    return this.{self::MyFuture::noSuchMethod}(new core::_InvocationMirror::_withoutType("timeout", const <core::Type>[], core::List::unmodifiable<dynamic>(<dynamic>[timeLimit]), core::Map::unmodifiable<core::Symbol, dynamic>(<core::Symbol, dynamic>{#onTimeout: onTimeout}), false)) as{TypeError} asy::Future<self::MyFuture::T>;
  no-such-method-forwarder method /* from org-dartlang-sdk:///sdk/lib/async/future.dart */ asStream() → asy::Stream<self::MyFuture::T>
    return this.{self::MyFuture::noSuchMethod}(new core::_InvocationMirror::_withoutType("asStream", const <core::Type>[], const <dynamic>[], core::Map::unmodifiable<core::Symbol, dynamic>(const <core::Symbol, dynamic>{}), false)) as{TypeError} asy::Stream<self::MyFuture::T>;
}
static method main() → void {
  self::MyFuture<core::double> f = self::foo().{self::MyFuture::then}<core::double>((dynamic _) → core::double => 2.3);
  self::MyFuture<core::int> f2 = let final<BottomType> #t1 = invalid-expression "pkg/front_end/testcases/inference/future_then_upwards_2.dart:21:51: Error: A value of type 'test::MyFuture<dart.core::double>' can't be assigned to a variable of type 'test::MyFuture<dart.core::int>'.
Try changing the type of the left hand side, or casting the right hand side to 'test::MyFuture<dart.core::int>'.
  MyFuture<int> f2 = /*error:INVALID_ASSIGNMENT*/ f;
                                                  ^" in f as{TypeError} self::MyFuture<core::int>;
  self::MyFuture<core::num> f3 = self::foo().{self::MyFuture::then}<core::double>((dynamic _) → core::double => 2.3) as self::MyFuture<core::double>;
}
static method foo() → self::MyFuture<dynamic>
  return new self::MyFuture::value<core::int>(1);