Unification: Fixing bug in materialize_evar (spotted by MathClasses). Also fixed apparent other bug in the presence of let-ins.
Unification: Fixing bug in materialize_evar (spotted by MathClasses).
Also fixed apparent other bug in the presence of let-ins.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@15099 85f007b7-540e-0410-9357-904b9bb8a0f7

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