public static boolean isValidQualifier(PsiMethodReferenceExpression expression) {
    final PsiElement referenceNameElement = expression.getReferenceNameElement();
    if (referenceNameElement instanceof PsiKeyword) {
      final PsiElement qualifier = expression.getQualifier();
      if (qualifier instanceof PsiTypeElement) {
        return true;
      }
      if (qualifier instanceof PsiReferenceExpression && ((PsiReferenceExpression)qualifier).resolve() instanceof PsiClass) {
        return true;
      }
    }
    return false;
  }
public static boolean isValidQualifier(PsiMethodReferenceExpression expression)