[PATCH 6/9]: C++ P0482R5 char8_t: A small correction to a common testsuite header file

[Jonathan Wakely]

On 05/11/18 14:40 -0500, Tom Honermann wrote:
>This patch corrects ambiguous partial specializations of 
>typelist::detail::append_.  Previously, neither append_<chain<Hd, Tl>, 
>Typelist_Chain> nor append_<Typelist_Chain, null_type> was a better 
>match for append_<chain<Hd, Tl>, null_type>.
>
>libstdc++-v3/ChangeLog:
>
>2018-11-04  Tom Honermann  <tom@honermann.net>
>
>     * include/ext/typelist.h: Constrained a partial specialization of
>       typelist::detail::append_ to only match chain<T1,T2>.
>
>Tom.

Committed to trunk, thanks.


>diff --git a/libstdc++-v3/include/ext/typelist.h b/libstdc++-v3/include/ext/typelist.h
>index b21f01ffb43..2cdbc3efafa 100644
>--- a/libstdc++-v3/include/ext/typelist.h
>+++ b/libstdc++-v3/include/ext/typelist.h
>@@ -215,10 +215,10 @@ namespace detail
>       typedef Typelist_Chain 			      		type;
>     };
> 
>-  template<typename Typelist_Chain>
>-    struct append_<Typelist_Chain, null_type>
>+  template<typename Hd, typename Tl>
>+    struct append_<chain<Hd, Tl>, null_type>
>     {
>-      typedef Typelist_Chain 					type;
>+      typedef chain<Hd, Tl>  					type;
>     };
> 
>   template<>