patch 8.0.0555: toupper/tolower test fails on OSX without Darwin commit https://github.com/vim/vim/commit/d2381a2cadb9ef359ad5efb916734c635b29bd13 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Apr 9 14:58:15 2017 +0200 patch 8.0.0555: toupper/tolower test fails on OSX without Darwin Problem: Toupper/tolower test fails on OSX without Darwin. Solution: Skip that part of the test also for OSX. (Kazunobu Kuriyama)