@Override
      public void visitReferenceExpression(@NotNull PsiReferenceExpression referenceExpression) {
        super.visitReferenceExpression(referenceExpression);
        PsiElement resolved = referenceExpression.resolve();
        if (resolved instanceof PsiVariable && inputVariables.contains(resolved)) {
          found.add((PsiVariable)resolved);
        }
      }
@Override
      public void visitReferenceExpression(@NotNull PsiReferenceExpression referenceExpression)