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src/HOL/Option.thy
changeset 5445 3905974ad555
parent 5183 89f162de39cf
child 9001 93af64f54bf2 
--- a/src/HOL/Option.thy	Wed Sep 09 17:21:33 1998 +0200
+++ b/src/HOL/Option.thy	Wed Sep 09 17:23:42 1998 +0200
@@ -23,6 +23,7 @@
   o2s	   :: "'a option => 'a set"
 
 primrec
+
  "o2s  None    = {}"
  "o2s (Some x) = {x}"
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