[PATCH] PR libstdc++/80939 Remove unmeetable constexpr specifiers

[Tim Song]

On Fri, Jun 2, 2017 at 9:07 AM, Jonathan Wakely <jwakely@redhat.com> wrote:
> we aren't qualifying calls to __ref_cast,

Turns out this is fine. I somehow managed to completely misread the
last sentence of [basic.lookup.argdep]/2. It's talking about the case
where an argument to the call is a set of overloaded functions named
by a template-id, not about the postfix-expression.

At least qualifying those calls doesn't hurt either.

Sorry :(