Fix bug #2004 due to bad handling of evars in the unification for  the setoid_rewrite variant called by rewrite (bug traced by Hugo).
Fix bug #2004 due to bad handling of evars in the unification for 
the setoid_rewrite variant called by rewrite (bug traced by Hugo).


git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@11822 85f007b7-540e-0410-9357-904b9bb8a0f7

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