[libcxx-commits] [libcxx] [libc++][mdspan][NFC] Remove redundant `else` and trailing semicolons (PR #175024)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

I slightly rephrased the PR title to explicitly say "`else` and trailing semicolons".

https://github.com/llvm/llvm-project/pull/175024