[PATCH] [RFC] span-v2: using concepts, constraints and ranges:: instead of enable_if

[Jonathan Wakely]

On 05/12/19 13:49 +0000, Jonathan Wakely wrote:
>This also causes two new FAILs in 23_containers/span/lwg3255.cc but
>that turns out to be a bug in the test, which fails now t hat you've
>fixed a bug in span. I'll fix that as well.

Here's that fix for the buggy test.

Tested powerpc64le-linux, committed to trunk as attached.


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