make the testsuite work without installing OCaml

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13682 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
#5980: warning on open statements which shadow an existing identifier (which turns out to be actually used in the scope of the open).

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13683 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Typo.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13684 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02