Clause

src/prolog/ast/logic/Clause.kt

@@ -20,7 +20,7 @@ import prolog.logic.unifyLazy
  * @see [Predicate]
  */
 abstract class Clause(var head: Head, var body: Body) : Term, Resolvent {
-    val functor: FunctorInfo = head.functor
+    val functor: Functor = head.functor
 
     override fun solve(goal: Goal, subs: Substitutions): Answers = sequence {
         // If the clause is a rule, unify the goal with the head and then try to prove the body.