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