[libcxx-commits] [libcxx] [libc++] Add missing assertion in std::span constructor (PR #118396)

[David Benjamin via libcxx-commits]

davidben wrote:

(I ran into this because I was playing around with some ideas locally on how to capture some invariants in my project and was trying to diagnose an unexpected uncleared precondition.)

https://github.com/llvm/llvm-project/pull/118396