@Override
    public void visitRegExpConditional(RegExpConditional conditional) {
      super.visitRegExpConditional(conditional);
      if (mySupport != RegExpLanguageHost.Lookbehind.FULL) {
        stopAndReportError(conditional, RegExpBundle.message("error.conditional.group.reference.not.allowed.inside.lookbehind"));
      }
    }
@Override
    public void visitRegExpConditional(RegExpConditional conditional)