patch 8.0.0270: may get ml_get error when :rubydo deletes lines commit https://github.com/vim/vim/commit/c593fee0e5e850f7e75be41f5d1751f28892a27f Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 29 23:11:25 2017 +0100 patch 8.0.0270: may get ml_get error when :rubydo deletes lines Problem: May get ml_get error when :rubydo deletes lines or switches to another buffer. (Nikolai Pavlov, issue https://github.com/vim/vim/issues/1421) Solution: Check the buffer and line every time.