From e4d0a5557521c03e1596ea148abee26e8b544b9f Mon Sep 17 00:00:00 2001
From: "Ralf W. Grosse-Kunstleve" <rwgk@google.com>
Date: Mon, 1 Jul 2024 10:26:18 -0700
Subject: [PATCH] Remove is_holder_type<unique_ptr>

---
 include/pybind11/cast.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/include/pybind11/cast.h b/include/pybind11/cast.h
index 624b8ebac..84cf8dafa 100644
--- a/include/pybind11/cast.h
+++ b/include/pybind11/cast.h
@@ -878,9 +878,6 @@ struct always_construct_holder {
 template <typename base, typename holder>
 struct is_holder_type
     : std::is_base_of<detail::type_caster_holder<base, holder>, detail::type_caster<holder>> {};
-// Specialization for always-supported unique_ptr holders:
-template <typename base, typename deleter>
-struct is_holder_type<base, std::unique_ptr<base, deleter>> : std::true_type {};
 
 #ifdef PYBIND11_DISABLE_HANDLE_TYPE_NAME_DEFAULT_IMPLEMENTATION // See PR #4888