patch 8.0.1749: VMS: 100% CPU use, redefining mch_open() fails commit https://github.com/vim/vim/commit/6537c421bb626ee92a2487a543e6287d33461bd0 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Apr 23 20:46:16 2018 +0200 patch 8.0.1749: VMS: 100% CPU use, redefining mch_open() fails Problem: VMS: 100% CPU use, redefining mch_open() and mch_fopen() fails. Solution: Do not wait indefinitely in RealWaitForChar(). (Neil Rieck) Do not redefine mch_open() and mch_fopen() on VMS. (Zoltan Arpadffy)