private static void parseNamedGroupRef(PsiBuilder builder, PsiBuilder.Marker marker, IElementType type) {
    builder.advanceLexer();
    checkMatches(builder, RegExpTT.NAME, RegExpBundle.message("parse.error.group.name.expected"));
    checkMatches(builder, type, RegExpBundle.message("parse.error.unclosed.group.reference"));
    marker.done(RegExpElementTypes.NAMED_GROUP_REF);
  }
private static void parseNamedGroupRef(PsiBuilder builder, PsiBuilder.Marker marker, IElementType type)