[Bug c++/109763] GCC accepts invalid program involving decltype(classtype::memberfunction) when used with concepts

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109763

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

           What    |Removed                     |Added
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         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jason Liam from comment #4)

> template < typename T >
> concept test = std::same_as <T::value, int(int) >;  

That is because the code is invalid and you need typename in front of T::value
if you want to refer to T::value as a type rather than a value here like so:
concept test = std::same_as <typename T::value, int(int) >;