PR#5686: Add testcase.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13255 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#4592: Add test case.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13256 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02