[Bug c++/89793] Implicit conversion to std::string is ambiguous on GCC 8.2 but not GCC 7.3

[duyang.seu at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89793

--- Comment #8 from du yang <duyang.seu at gmail dot com> ---

> 
> struct Message {
>   template<typename T>
>     Message(T&& t) : s{t} { }
>   string s;
> };
> 

By the way, it works on both GCC 8 & 7, if change the code above as below
(change to use assignment),

 struct Message {
   template<typename T>
     Message(T&& t) { s = t; }
   string s;
 };