[v3 PATCH] Implement LWG 2534, Constrain rvalue stream operators.

[Ville Voutilainen]

On 30 November 2016 at 16:59, David Edelsohn <dje.gcc@gmail.com> wrote:
> I believe that this broke g++.old-deja/g++.law/ctors10.C
>
> invalid initialization of reference of type 'Klasse::Err&' from
> expression of type 'std::basic_ostream<char>::__ostream_type {aka
> std::basic_ostream<char>}


I'll take a look.