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

static method test() → dynamic {
  asy::Future<core::int> f;
  asy::Future<core::List<core::int>> b = f.{asy::Future::then}<core::List<dynamic>>((core::int x) → core::List<dynamic> => <dynamic>[]).{asy::Future::whenComplete}(() → core::Null {}) as{TypeError} asy::Future<core::List<core::int>>;
  b = f.{asy::Future::then}<core::List<core::int>>((core::int x) → core::List<core::int> => <core::int>[]);
}
static method main() → dynamic {}