Make sure the constructors of Z and positive are recognized: they show up when parsing expressions between back-quotes.
Make sure the constructors of Z and positive are recognized: they show up
when parsing expressions between back-quotes.


git-svn-id: a49b465eaba45b67e2e1e4e0b2c256a71f59fecb@1538 85f007b7-540e-0410-9357-904b9bb8a0f7

SamB/coq