[Bug c++/66834] [concepts] concept parameter kind mismatch causes hard error

[andrew.n.sutton at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66834

--- Comment #7 from Andrew Sutton <andrew.n.sutton at gmail dot com> ---
> I would expect a partial ordering to prefer the two-parameter overload in that
> case. But yeah, it's a separate issue.

The problem is that partial ordering doesn't apply to template
parameters whose arguments can only be given explicitly. I got caught
by this last year, and sent an email to core, and then (I think) Ville
submitted a core issue or NB comment (I don't remember the details).

Andrew