fix setup_hook

2019-01-16 20:03:59 -07:00
parent 2a4981ba85
commit 18f0263d23
2 changed files with 2 additions and 1 deletions
--- a/src/prolog/toplevel.rs
+++ b/src/prolog/toplevel.rs
@@ -625,7 +625,7 @@ impl RelationWorker {
                if name == hook.name() && terms.len() == hook.arity() {
                    let term = setup_fact(Term::Clause(r, name, terms, None))?;
                    Ok((hook, PredicateClause::Fact(term), VecDeque::from(vec![])))
-                } else if name.as_str() == ":-" {
+                } else if name.as_str() == ":-" && terms.len() == 2 {
                    let rule = self.setup_rule(indices, terms, true)?;
                    let results_queue = self.parse_queue(indices)?;