src/HOL/Predicate_Compile_Examples/Code_Prolog_Examples.thy

 imports Code_Prolog
 begin
 
 section {* Example append *}
 
+
 inductive append
 where
   "append [] ys ys"
 | "append xs ys zs ==> append (x # xs) ys (x # zs)"
 
+ML {* Code_Prolog.options := { ensure_groundness = false, limited_types = [], prolog_system = Code_Prolog.SWI_PROLOG} *}
+
+values "{(x, y, z). append x y z}"
+
 values 3 "{(x, y, z). append x y z}"
+
+ML {* Code_Prolog.options := { ensure_groundness = false, limited_types = [], prolog_system = Code_Prolog.YAP} *}
+
+values "{(x, y, z). append x y z}"
+
+ML {* Code_Prolog.options := { ensure_groundness = false, limited_types = [], prolog_system = Code_Prolog.SWI_PROLOG} *}
 
 
 section {* Example queens *}
 
 inductive nodiag :: "int => int => int list => bool"

 
 inductive notB :: "abc => bool"
 where
   "y \<noteq> B \<Longrightarrow> notB y"
 
-ML {* Code_Prolog.options := {ensure_groundness = true, limited_types = []} *}
+ML {* Code_Prolog.options := {ensure_groundness = true, limited_types = [], prolog_system = Code_Prolog.SWI_PROLOG} *}
 
 values 2 "{y. notB y}"
 
 inductive notAB :: "abc * abc \<Rightarrow> bool"
 where