[Bug c++/103553] Show what decltype deduced in static_assert

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103553

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-12-07
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, we do it for the template case but if it was not in a template we
don't, notice:

#include <type_traits>

template<class T>
class f
{
   int && r;
  static_assert (std::is_same_v<decltype(r), int>,"");
};
class f1
{
   int && r;
  static_assert (std::is_same_v<decltype(r), int>,"");
};

void
g ()
{
  int &&r = 42;
  f<decltype(r)> t;
}