private static boolean parseFieldName(PsiBuilder builder) {
    PsiBuilder.Marker marker = builder.mark();
    if (!advanceIfMatches(builder, JqlTokenTypes.VALID_FIELD_NAMES)) {
      builder.error(TaskBundle.message("parsing.error.expecting.field.name"));
      marker.drop();
      return false;
    }
    marker.done(JqlElementTypes.IDENTIFIER);
    return true;
  }
private static boolean parseFieldName(PsiBuilder builder)