Remove functor from gen_rules (#2608)
Remove functor from gen_rules (#2608)

Remove functor from gen_rules

Co-authored-by: Jérémie Dimino <aa5d8c8bb73d4465608582ffc8dcd3cb76639f53@dimino.org>
dra27/jbuilder,dra27/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder