Add ext/attrs shortcut on module and module type expressions.
Add ext/attrs shortcut on module and module type expressions.

eliberis/ocaml,msprotz/ocaml,eliberis/ocaml,msprotz/ocaml,eliberis/ocaml,yunxing/ocaml,yunxing/ocaml,yunxing/ocaml,eliberis/ocaml,yunxing/ocaml,gerdstolpmann/ocaml,msprotz/ocaml,msprotz/ocaml,msprotz/ocaml,eliberis/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,yunxing/ocaml,gerdstolpmann/ocaml