Bug fixed (reported by Maggesi): sometimes when the tactic had to generate new existential variables it failed. Fixing by propagating the metavariable environment generated by the unification.
Bug fixed (reported by Maggesi): sometimes when the tactic had to generate new
existential variables it failed. Fixing by propagating the metavariable
environment generated by the unification.


git-svn-id: a49b465eaba45b67e2e1e4e0b2c256a71f59fecb@6215 85f007b7-540e-0410-9357-904b9bb8a0f7

SamB/coq