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(dynamic 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 {
  dynamic f = self::foo().then((dynamic _) → dynamic => 2.3);
  self::MyFuture<core::int> f2 = f;
  self::MyFuture<core::num> f3 = self::foo().then((dynamic _) → dynamic => 2.3) as self::MyFuture<core::double>;
}
static method foo() → self::MyFuture<dynamic>
  return new self::MyFuture::value<core::int>(1);