properly handle undefined predicates declared dynamic

2019-10-02 22:01:32 -06:00
parent 04bc8ec084
commit 516c66a47d
6 changed files with 68 additions and 41 deletions
--- a/src/prolog/write.rs
+++ b/src/prolog/write.rs
@@ -48,6 +48,7 @@ impl fmt::Display for REPLCodePtr {
 impl fmt::Display for IndexPtr {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
+            &IndexPtr::DynamicUndefined => write!(f, "undefined"),
            &IndexPtr::Undefined => write!(f, "undefined"),
            &IndexPtr::Index(i) => write!(f, "{}", i),
        }