src/HOL/Option.thy
changeset 5445 3905974ad555
parent 5183 89f162de39cf
child 9001 93af64f54bf2
     1.1 --- a/src/HOL/Option.thy	Wed Sep 09 17:21:33 1998 +0200
     1.2 +++ b/src/HOL/Option.thy	Wed Sep 09 17:23:42 1998 +0200
     1.3 @@ -23,6 +23,7 @@
     1.4    o2s	   :: "'a option => 'a set"
     1.5  
     1.6  primrec
     1.7 +
     1.8   "o2s  None    = {}"
     1.9   "o2s (Some x) = {x}"
    1.10