/usr/share/vim/vim80/ftplugin/art.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | " Vim filetype plugin
" Language: ART-IM and ART*Enterprise
" Maintainer: Dorai Sitaram <ds26@gte.com>
" URL: http://www.ccs.neu.edu/~dorai/vimplugins/vimplugins.html
" Last Change: Apr 2, 2003
" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
finish
endif
run ftplugin/lisp.vim
setl lw-=if
setl lw+=def-art-fun,deffacts,defglobal,defrule,defschema,for,schema,while
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