[libcxx-commits] [libcxx] [libc++] Use static_asserts for span::front() and span::back() when possible (PR #119381)

[Louis Dionne via libcxx-commits]

ldionne wrote:

For added fun, it looks like it's not the first time we explore this: https://reviews.llvm.org/D71995
And also 9ab85a69dcee63c3f54214bb4495e6d20f7ec100.

https://github.com/llvm/llvm-project/pull/119381