[libc++] Add _LIBCPP_HIDE_FROM_ABI to the unsequenced_policy constructor

diff --git a/libcxx/include/execution b/libcxx/include/execution
index 30e6682..d73445d 100644 (file)
--- a/libcxx/include/execution
+++ b/libcxx/include/execution
@@ -87,7 +87,7 @@ constexpr __unsequenced_policy __unseq{__disable_user_instantiations_tag{}};
 #  if _LIBCPP_STD_VER >= 20
 
 struct unsequenced_policy {
-  constexpr explicit unsequenced_policy(__disable_user_instantiations_tag) {}
+  _LIBCPP_HIDE_FROM_ABI constexpr explicit unsequenced_policy(__disable_user_instantiations_tag) {}
   unsequenced_policy(const unsequenced_policy&)            = delete;
   unsequenced_policy& operator=(const unsequenced_policy&) = delete;
 };