Trilby [1] filed a deletion request for llvm37-split [2]:

A comment claimed this wouldn't build 1.5 years ago, and it's been flagged out of date for almost a year with no action by the maintainer.

Removal would keep the AUR tidy and save time of those who might otherwise attempt to build this and fail.

[1] https://aur.archlinux.org/account/Trilby/ [2] https://aur.archlinux.org/pkgbase/llvm37-split/