/usr/share/vim/addons/ftdetect/omlet.vim is in ocaml-tools 20120103-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | au BufRead,BufNewFile *.ml,*.mli set ft=omlet
" setf omlet would result in having omlet not loaded cause system's
" filetype.vim defines ocaml.vim for .ml files.
" This is quite ugly, but we have to do this until ocaml.vim becomes omlet...
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