pkg/front_end/testcases/extensions/compounds.dart:12:43: Context: Possible promotion of other@340
  bool operator ==(Object other) => other is Number && value == other.value;
                                          ^^
pkg/front_end/testcases/extensions/compounds.dart:19:15: Context: Possible promotion of other@501
    if (other is int) {
              ^^
pkg/front_end/testcases/extensions/compounds.dart:21:22: Context: Possible promotion of other@501
    } else if (other is Number) {
                     ^^
pkg/front_end/testcases/extensions/compounds.dart:28:15: Context: Possible promotion of other@501
    if (other is int) {
              ^^
pkg/front_end/testcases/extensions/compounds.dart:30:22: Context: Possible promotion of other@501
    } else if (other is Number) {
                     ^^
pkg/front_end/testcases/extensions/compounds.dart:104:16: Context: Write to v@2369
  expect(n1, v += n1);
               ^^
pkg/front_end/testcases/extensions/compounds.dart:105:16: Context: Write to v@2369
  expect(n2, v += n1);
               ^^
pkg/front_end/testcases/extensions/compounds.dart:106:16: Context: Write to v@2369
  expect(n0, v -= n2);
               ^^
pkg/front_end/testcases/extensions/compounds.dart:107:16: Context: Write to v@2369
  expect(n1, v += n1);
               ^^
pkg/front_end/testcases/extensions/compounds.dart:108:16: Context: Write to v@2369
  expect(n0, v -= n1);
               ^^
pkg/front_end/testcases/extensions/compounds.dart:109:14: Context: Write to v@2369
  expect(n1, ++v);
             ^^
pkg/front_end/testcases/extensions/compounds.dart:110:14: Context: Write to v@2369
  expect(n0, --v);
             ^^
pkg/front_end/testcases/extensions/compounds.dart:111:15: Context: Write to v@2369
  expect(n0, v++);
              ^^
pkg/front_end/testcases/extensions/compounds.dart:112:15: Context: Write to v@2369
  expect(n1, v--);
              ^^
pkg/front_end/testcases/extensions/compounds.dart:116:5: Context: Write to v@2369
  v += n1;
    ^^
pkg/front_end/testcases/extensions/compounds.dart:118:5: Context: Write to v@2369
  v += n1;
    ^^
pkg/front_end/testcases/extensions/compounds.dart:120:5: Context: Write to v@2369
  v -= n2;
    ^^
pkg/front_end/testcases/extensions/compounds.dart:122:5: Context: Write to v@2369
  v += n1;
    ^^
pkg/front_end/testcases/extensions/compounds.dart:124:5: Context: Write to v@2369
  v -= n1;
    ^^
pkg/front_end/testcases/extensions/compounds.dart:126:3: Context: Write to v@2369
  ++v;
  ^^
pkg/front_end/testcases/extensions/compounds.dart:128:3: Context: Write to v@2369
  --v;
  ^^
pkg/front_end/testcases/extensions/compounds.dart:130:4: Context: Write to v@2369
  v++;
   ^^
pkg/front_end/testcases/extensions/compounds.dart:132:4: Context: Write to v@2369
  v--;
   ^^
pkg/front_end/testcases/extensions/compounds.dart:285:14: Context: Write to expected@7409
    expected = null;
             ^