commit https://github.com/vim/vim/commit/16b3578f355282846f2600ce77fb344950f0b9ce Author: Bram Moolenaar <Bram@vim.org> Date: Fri Sep 9 20:29:50 2016 +0200 patch 7.4.2355 Problem: Regexp fails to match when using "\>\)\?". (Ramel) Solution: When a state is already in the list, but addstate_here() is used and the existing state comes later, add the new state anyway.

" Vim compiler file
" Compiler:     ATT dot
" Maintainer:	Marcos Macedo <bar4ka@bol.com.br>
" Last Change:	2004 May 16

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

if exists(":CompilerSet") != 2		" older Vim always used :setlocal
  command -nargs=* CompilerSet setlocal <args>
endif

CompilerSet makeprg=dot\ -T$*\ \"%:p\"\ -o\ \"%:p:r.$*\"