Thu, 02 Jan 2014 19:07:36 +0100 blanchet removed pointless warning (cf. http://stackoverflow.com/questions/20233463/isabelle-metis-proof-state-contains-the-universal-sort/20785045#20785045)
Thu, 02 Jan 2014 09:50:22 +0100 blanchet consider code as exhaustive
Thu, 02 Jan 2014 09:50:22 +0100 blanchet proper handling of corner case, take 2
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