We apparently don't have a working std::u8string in our SDK currently. The two places this hits are gtest which expects it if the char8_t feature test exists and WTF::FileSystem. The latter has a way around it already, so add us to the conditions that avoid it. The former is more interesting.
Created attachment 448526 [details] [fast-cq] Patch
Committed r287718 (245801@main): <https://commits.webkit.org/245801@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 448526 [details].
<rdar://problem/87221267>