patch 8.0.1251: invalid expressin passed to WaitFor() commit https://github.com/vim/vim/commit/d97fbf171ec0e63117813da045d2a1c51a9b6f62 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 2 19:23:03 2017 +0100 patch 8.0.1251: invalid expressin passed to WaitFor() Problem: Invalid expressin passed to WaitFor(). Solution: Check if the variable exists.

" Vim compiler file
" Compiler:	Microsoft Visual C
" Maintainer:	Bram Moolenaar <Bram@vim.org>
" Last Change:	2014 Sep 20

if exists("current_compiler")
  finish
endif
let current_compiler = "msvc"

" The errorformat for MSVC is the default.
CompilerSet errorformat&
CompilerSet makeprg=nmake