- Some improvements to `std::midpoint` implementation: replaces
`enable_if` with concepts.
https://wg21.link/numeric.ops.midpoint
Towards #172124
---------
Co-authored-by: Hristo Hristov <zingam@outlook.com>
I made sure they all had some expected-error output in them. Many of
these tests would be better implemented as a positive test using SFINAE,
but this is beyond the scope of this patch.
Differential Revision: https://reviews.llvm.org/D153980