@NotNull
  private static TextRange calculateErrorRange(@NotNull String rawText, int start) {
    int end;
    if (rawText.charAt(start + 1) == 'u') {
      end = start + 2;
      while (rawText.charAt(end) == 'u') end++;
      end += 4;
    }
    else end = start + 2;
    return new TextRange(start, end);
  }
@NotNull
  private static TextRange calculateErrorRange(@NotNull String rawText, int start)