[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)

[rs2740 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013

TC <rs2740 at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |rs2740 at gmail dot com

--- Comment #4 from TC <rs2740 at gmail dot com> ---
I don't think this needs an extra constraint, just reordering the existing ones
to check not-a-span (14.3, "remove_­cvref_­t<R> is not a specialization of
span") first.

But this is very much undefined anyway.