pkg/front_end/testcases/inference/future_or_subtyping.dart

// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart=2.9
/*@testedFeatures=inference*/
library test;

import 'dart:async';

void add(int x) {}
add2(int y) {}
test() {
  Future<int> f;
  var /*@ type=Future<void>* */ a =
      f. /*@ typeArgs=void */ /*@target=Future.then*/ then(add);
  var /*@ type=Future<dynamic>* */ b =
      f. /*@ typeArgs=dynamic */ /*@target=Future.then*/ then(add2);
}

main() {}