pkg/front_end/testcases/invalid_assignment.dart:10:5: Context: Write to i@273
  i = 1;
    ^
pkg/front_end/testcases/invalid_assignment.dart:11:5: Context: Write to i@273
  i = s;
    ^
pkg/front_end/testcases/invalid_assignment.dart:12:5: Context: Write to i@273
  i ??= 1;
    ^^^
pkg/front_end/testcases/invalid_assignment.dart:13:5: Context: Write to i@273
  i ??= s;
    ^^^
pkg/front_end/testcases/invalid_assignment.dart:14:5: Context: Write to a@288
  a = new A();
    ^
pkg/front_end/testcases/invalid_assignment.dart:15:5: Context: Write to a@288
  a += 1;
    ^^