PR#5835: the fix was changed to be compatible with existing programs

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13299 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Add some test cases for syntactic constructs that are never used.


git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13300 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02