[libcxx-commits] [libcxx] [libc++] Add an ABI setting to harden unique_ptr<T[]>::operator[] (PR #91798)

[Konstantin Varlamov via libcxx-commits]

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@@ -411,11 +518,13 @@ class _LIBCPP_UNIQUE_PTR_TRIVIAL_ABI _LIBCPP_TEMPLATE_VIS unique_ptr<_Tp[], _Dp>
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unique_ptr(unique_ptr&& __u) _NOEXCEPT
       : __ptr_(__u.release()),
-        __deleter_(std::forward<deleter_type>(__u.get_deleter())) {}
+        __deleter_(std::forward<deleter_type>(__u.get_deleter())),
+        __checker_(std::move(__u.__checker_)) {}
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unique_ptr& operator=(unique_ptr&& __u) _NOEXCEPT {
     reset(__u.release());
     __deleter_ = std::forward<deleter_type>(__u.get_deleter());
+    __checker_ = std::move(std::move(__u.__checker_));
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var-const wrote:

What's the purpose of doing a double move here? Is it a typo, perhaps?

https://github.com/llvm/llvm-project/pull/91798