Catch AbstractionOverMeta as a unification failure in precatchable_exception. Allows rewrite H in * |- to work in case a rewrite throws this exception.
Catch AbstractionOverMeta as a unification failure in precatchable_exception.
Allows rewrite H in * |- to work in case a rewrite throws this exception.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@14166 85f007b7-540e-0410-9357-904b9bb8a0f7

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