commit https://github.com/vim/vim/commit/361c8f0e517e41f1f1d34dae328044406fde80ac Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jul 2 15:41:47 2016 +0200 patch 7.4.1980 Problem: 'errorformat' is parsed for every call to ":caddexpr". Can't add to two location lists asynchronously. Solution: Keep the previously parsed data when appropriate. (mostly by Yegappan Lakshmanan)