pkg/front_end/testcases/inference/for_loop_promotion.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.

/*@testedFeatures=inference*/
library test;

void test() {
  for (num x = 0; x /*@target=num.<*/ < 10; x /*@target=num.+*/ ++) {
    if (x is int) {
      var /*@ type=int* */ y = /*@ promotedType=int* */ x;
    }
  }
}

main() {}