@Override public void visitReferenceExpression(final @NotNull PsiReferenceExpression expression) {
          super.visitReferenceExpression(expression);
          if (!expression.isQualified() && expression.isReferenceTo(variable)) {
            result.add(expression);
          }
        }
@Override public void visitReferenceExpression(final @NotNull PsiReferenceExpression expression)