@Contract(value = "_ -> this", mutates = "this")
    @CheckReturnValue
    public ProblemBuilder fix(@NotNull LocalQuickFix fix) {
      myFixes.add(fix);
      return this;
    }
@Contract(value = "_ -> this", mutates = "this")
    @CheckReturnValue
    public ProblemBuilder fix(@NotNull LocalQuickFix fix)