[libcxx-commits] [libcxx] [libc++] Implement LWG3662 basic_string::append/assign(NTBS, pos, n) suboptimal (PR #206320)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja approved this pull request.

LGTM with CI becoming green enough (except for failures on FreeBSD which are being fixed).

https://github.com/llvm/llvm-project/pull/206320