[Bug c++/70862] [concepts] adding a concept-constrained version of a variable template causes multiple definition assembler error

[tom at honermann dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70862

--- Comment #4 from Tom Honermann <tom at honermann dot net> ---
(In reply to ryan.burn from comment #3)
> It's a different bug. The test case from 70095 compiles fine with the trunk
> from 20160428, but the above example won't.

The example in bug 70095 comment 2 still fails the same way.  That example is
known to be a regression caused by the change noted in bug 70095 comment 1 that
intended to fix the example in bug 70095 comment 0.  That change also affected
the behavior of the example in bug 69515 (but didn't fix it).  I don't know how
related these issues are.