doc-src/Tutorial/Datatype/Term.thy

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc-src/Tutorial/Datatype/Term.thy	Thu Nov 12 16:45:40 1998 +0100
@@ -0,0 +1,16 @@
+Term = Main +
+datatype 'a t = A | B "'a * ('a t list)"
+datatype expr = Var string | Lam string expr | App expr expr
+              | Data data
+and      data = Bool bool | Num nat
+              | Closure string expr "(string * data)list"
+datatype ('a,'b)term = Var 'a | App 'b ((('a,'b)term)list)
+consts
+   subst  :: ('a => ('a,'b)term) => ('a,'b)term      => ('a,'b)term
+   substs :: ('a => ('a,'b)term) => ('a,'b)term list => ('a,'b)term list
+primrec
+  "subst s (Var x) = s x"
+  "subst s (App f ts) = App f (substs s ts)"
+  "substs s [] = []"
+  "substs s (t # ts) = subst s t # substs s ts"
+end