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src/FOLP/IFOLP.ML
changeset 18977 f24c416a4814
parent 17480 fd19f77dcf60
child 19046 bc5c6c9b114e 
--- a/src/FOLP/IFOLP.ML	Wed Feb 08 09:27:20 2006 +0100
+++ b/src/FOLP/IFOLP.ML	Wed Feb 08 14:39:00 2006 +0100
@@ -77,7 +77,7 @@
           and concl = discard_proof (Logic.strip_assums_concl prem)
       in
           if exists (fn hyp => hyp aconv concl) hyps
-          then case distinct (List.filter (fn hyp=> could_unify(hyp,concl)) hyps) of
+          then case gen_distinct (op =) (List.filter (fn hyp=> could_unify(hyp,concl)) hyps) of
                    [_] => assume_tac i
                  |  _  => no_tac
           else no_tac
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