From 884b0ca10eac28e300dbfddb1455f3cfd7ad0aa6 Mon Sep 17 00:00:00 2001
From: Markus Triska <triska@metalevel.at>
Date: Wed, 8 Mar 2023 21:16:54 +0100
Subject: [PATCH] FIXED: Take all variables into account during goal
 projection.

This addresses #1751.
---
 src/lib/dif.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/dif.pl b/src/lib/dif.pl
index 20842b27..73d65518 100644
--- a/src/lib/dif.pl
+++ b/src/lib/dif.pl
@@ -65,7 +65,7 @@ dif(X, Y) :-
 
 gather_dif_goals(_, []) --> [].
 gather_dif_goals(V, [(X \== Y) | Goals]) -->
-    (  { term_variables(X, [V0 | _]),
+    (  { term_variables(X-Y, [V0 | _]),
          V == V0 } ->
        [dif:dif(X, Y)]
     ;  []
-- 
2.54.0