private static PsiReferenceExpression findReferenceTo(@NotNull PsiElement element, @NotNull PsiVariable variable) {
    if (element instanceof PsiReferenceExpression
        && ExpressionUtil.isEffectivelyUnqualified((PsiReferenceExpression)element)
        && ((PsiReferenceExpression)element).isReferenceTo(variable)) {
      return (PsiReferenceExpression)element;
    }
    for (PsiElement child = element.getFirstChild(); child != null; child = child.getNextSibling()) {
      final PsiReferenceExpression reference = findReferenceTo(child, variable);
      if (reference != null) return reference;
    }
    return null;
  }
private static PsiReferenceExpression findReferenceTo(@NotNull PsiElement element, @NotNull PsiVariable variable)