Quick hack to solve to complexity issue in function mark_occur (but should probably not work in presence of morphisms to Leibniz's equality).
Quick hack to solve to complexity issue in function mark_occur
(but should probably not work in presence of morphisms to Leibniz's equality).


git-svn-id: a49b465eaba45b67e2e1e4e0b2c256a71f59fecb@9331 85f007b7-540e-0410-9357-904b9bb8a0f7

SamB/coq