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IOA/meta_theory/Option.thy
changeset 168 44ff2275d44f
parent 156 fd1be45b64bf
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167:37a6e2f55230 168:44ff2275d44f 
       
     1 (*  Title:      Option.thy
 
       
     2     ID:         $Id$
 
       
     3     Author:     Tobias Nipkow
 
       
     4     Copyright   1994  TU Muenchen
 
       
     5 
       
     6 Datatype 'a option
 
       
     7 *)
 
       
     8 
     1 Option = Arith +
 
     9 Option = Arith +
 
     2 datatype 'a option = None | Some('a)
 
    10 datatype 'a option = None | Some('a)
 
     3 end
 
    11 end
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