Make it possible to perform proofs by induction even on non-inductive types, as long as one provides the induction principle.
Make it possible to perform proofs by induction even on non-inductive types,
as long as one provides the induction principle.


git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@1522 85f007b7-540e-0410-9357-904b9bb8a0f7

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