[Bug c++/67139] [concepts] ICE on checking concepts with void with variable template

[eric.niebler at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67139

Eric Niebler <eric.niebler at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[concepts] ICE on checking  |[concepts] ICE on checking
                   |concepts with void          |concepts with void with
                   |                            |variable template

--- Comment #3 from Eric Niebler <eric.niebler at gmail dot com> ---
The problem goes away when _v<T> is replaced with the equivalent T::type::value
in concept IsTrue_, so that seems to be the smoking gun.