@Contract("null -> false")
        private boolean isReferenceToParameter(@Nullable PsiElement element) {
          if (element == null) return false;
          final PsiReference reference = element.getReference();
          return reference != null && reference.isReferenceTo(PyNamedParameterImpl.this);
        }
@Contract("null -> false")
        private boolean isReferenceToParameter(@Nullable PsiElement element)