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src/HOL/Option.thy
changeset 66364 fa3247e6ee4b
parent 63648 f9f3006a5579
child 67091 1393c2340eec
equal deleted inserted replaced
66363:8aca34dbe195 66364:fa3247e6ee4b 
     3 *)
 
     3 *)
 
     4 
     4 
     5 section \<open>Datatype option\<close>
 
     5 section \<open>Datatype option\<close>
 
     6 
     6 
     7 theory Option
 
     7 theory Option
 
     8 imports Lifting Finite_Set
 
     8   imports Lifting
 
     9 begin
 
     9 begin
 
    10 
    10 
    11 datatype 'a option =
 
    11 datatype 'a option =
 
    12     None
 
    12     None
 
    13   | Some (the: 'a)
 
    13   | Some (the: 'a)
isabelle