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

class MyFuture<T extends core::Object> extends core::Object implements asy::Future<self::MyFuture::T> {
  constructor •() → void
    : super core::Object::•() {}
  constructor value(self::MyFuture::T x) → void
    : super core::Object::•() {}
  abstract method noSuchMethod(core::Invocation invocation) → dynamic;
  method then<S extends core::Object>((self::MyFuture::T) → asy::FutureOr<self::MyFuture::then::S> f, {core::Function onError = null}) → self::MyFuture<self::MyFuture::then::S>
    return null;
}
static method main() → void {
  self::MyFuture<core::double> f = self::foo().{self::MyFuture::then}<core::double>((dynamic _) → core::double => 2.3);
  asy::Future<core::int> f2 = let final dynamic #t1 = f in let dynamic _ = null in invalid-expression "pkg/front_end/testcases/inference/future_then_upwards.dart:21:49: Error: A value of type 'test::MyFuture<dart.core::double>' can't be assigned to a variable of type 'dart.async::Future<dart.core::int>'.
Try changing the type of the left hand side, or casting the right hand side to 'dart.async::Future<dart.core::int>'.
  Future<int> f2 = /*error:INVALID_ASSIGNMENT*/ f;
                                                ^";
  asy::Future<core::num> f3 = self::foo().{self::MyFuture::then}<core::double>((dynamic _) → core::double => 2.3) as asy::Future<core::double>;
}
static method foo() → self::MyFuture<dynamic>
  return new self::MyFuture::value<core::int>(1);