commit 728e639d82099035fdfe69b716a54717ae7050e0
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Oct 4 10:21:58 2021

    libstdc++: Add missing noexcept to std::variant helper
    
    libstdc++-v3/ChangeLog:
    
            * include/std/variant (__detail::__variant::__as): Add missing
            noexcept to first overload.

diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index d50c6b7de1d..6377b6731ea 100644
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -206,7 +206,7 @@ namespace __variant
 
   template<typename... _Types>
     constexpr std::variant<_Types...>&
-    __as(std::variant<_Types...>& __v)
+    __as(std::variant<_Types...>& __v) noexcept
     { return __v; }
 
   template<typename... _Types>