MarsSeed [1] filed a deletion request for icu59 [2]: Cleanup after the deletion of the long-broken but unneeded llvm50 (PRQ#47428).
Also icu59 fails to build from source, but no one mentioned it, indicating total disuse. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/icu59/
