Mention bind_front in static_assert(_Fn != nullptr) message

Author: JMazurkiewicz

libcxx/include/__functional/bind_front.h

@@ -87,7 +87,7 @@ template <auto _Fn, class... _Args>
   static_assert((is_move_constructible_v<decay_t<_Args>> && ...),
                 "bind_front requires all decay_t<Args> to be move constructible");
   if constexpr (using _Ty = decltype(_Fn); is_pointer_v<_Ty> || is_member_pointer_v<_Ty>)
-    static_assert(_Fn != nullptr, "f cannot be equal to nullptr");
+    static_assert(_Fn != nullptr, "bind_front: f cannot be equal to nullptr");
 
   if constexpr (sizeof...(_Args) == 0)
     return __nttp_bind_without_bound_args_t<_Fn>{};