commit https://github.com/vim/vim/commit/958dc6923d341390531888058495569d73c356c3 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Dec 1 15:34:12 2016 +0100 patch 8.0.0107 Problem: When reading channel output in a timer, messages may go missing. (Skywind) Solution: Add the "drop" option. Write error messages in the channel log. Don't have ch_canread() check for the channel being open.