Adding an `open_module` function to the Depend interface instead of
directly mutating `free_structure_names` makes the approach robust to
eventual improvement to ocamldep's handling of `open` (for example, in
presence of .cmi for the opened units it could add their submodules
to the set of bound vars). This only goes so far, however, as the
overall imperative style would not nicely support proper local
handling of `let open M in e`.
git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15468 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Jacques Garrigue
Gabriel Scherer
Damien Doligez
Alain Frisch
Maxence Guesdon