From a3fbf1bc739907acba3ac5688ddd78a2cc8676fd Mon Sep 17 00:00:00 2001
From: Mark Thom <markjordanthom@gmail.com>
Date: Mon, 14 Aug 2017 10:11:17 -0600
Subject: [PATCH] generalize has_null_ball

---
 src/prolog/machine.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/prolog/machine.rs b/src/prolog/machine.rs
index 04077fe2..53cb6ab7 100644
--- a/src/prolog/machine.rs
+++ b/src/prolog/machine.rs
@@ -1148,7 +1148,7 @@ impl MachineState {
 
     fn has_null_ball(&self) -> bool
     {
-        if let &Addr::Con(Constant::UInt64(0)) = &self.ball {
+        if let &Addr::Con(Constant::UInt64(_)) = &self.ball {
             true
         } else {
             false
-- 
2.54.0