patch 8.1.0747: map() with a bad expression doesn't give an error commit https://github.com/vim/vim/commit/ce9d50df07402cb8e196537a9c4505845adecabc Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jan 14 22:22:29 2019 +0100 patch 8.1.0747: map() with a bad expression doesn't give an error Problem: map() with a bad expression doesn't give an error. (Ingo Karkat) Solution: Check for giving an error message. (closes https://github.com/vim/vim/issues/3800)

" Vim indent file
" Language:             dict(1) configuration file
" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
" Latest Revision:      2006-12-20

if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

setlocal indentkeys=0{,0},!^F,o,O cinwords= autoindent smartindent
setlocal nosmartindent
inoremap <buffer> # X#