From: Mark Thom <markjordanthom@gmail.com>
Date: Thu, 23 Aug 2018 00:24:49 +0000 (-0600)
Subject: revert is_undefined back to ref match, re: #44
X-Git-Tag: v0.8.110~425
X-Git-Url: https://git.sagredo.dev/?a=commitdiff_plain;h=ddf5593e4454ea49221905ddaca78416d5f31939;p=scryer-prolog.git

revert is_undefined back to ref match, re: #44
---

diff --git a/src/prolog/ast.rs b/src/prolog/ast.rs
index 63aefed6..23425e9a 100644
--- a/src/prolog/ast.rs
+++ b/src/prolog/ast.rs
@@ -1575,7 +1575,7 @@ impl CodeIndex {
     pub fn is_undefined(&self) -> bool {
         let index_ptr = &self.0.borrow().0;
 
-        if let IndexPtr::Undefined = index_ptr {
+        if let &IndexPtr::Undefined = index_ptr {
             true
         } else {
             false