[Bug libstdc++/102807] Simple code using ranges::views::keys does not compile with clang

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102807

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
https://reviews.llvm.org/D119544 should fix this when it lands.