Add backtracking to the evaluator. This means we have to keep track of choicepoints which is implemented the easy but wasteful way for now.

I have also added a number which is used to differentiate variables from different application of the clauses.

1 files changed, 1 insertions, 1 deletions

diff --git a/fns.h b/fns.h
index 70a1d96..92794bf 100644
--- a/fns.h
+++ b/fns.h
@@ -5,7 +5,7 @@ Term *parse(int);
 Rune *prettyprint(Term *);
 
 /* misc.c */
-Term *copyterm(Term *);
+Term *copyterm(Term *, uvlong *);
 Term *appendterm(Term *, Term *);
 int termslength(Term *);
 Term *mkatom(Rune *);