From 21c61b6e3a808fb8034ab72dfb0444a786f2a74b Mon Sep 17 00:00:00 2001
From: bakaq <bakaq@bakaq.net>
Date: Sat, 30 Sep 2023 21:33:42 -0300
Subject: [PATCH] Add tests for #2056

---
 src/tests/dif.pl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/tests/dif.pl b/src/tests/dif.pl
index bb1c76d6..752f1405 100644
--- a/src/tests/dif.pl
+++ b/src/tests/dif.pl
@@ -196,6 +196,17 @@ test("scryer-prolog#1956",(
     Res = []
 )).
 
+% https://github.com/mthom/scryer-prolog/issues/2056
+test("scryer-prolog#2056",(
+    set_prolog_flag(occurs_check, false),
+    C=[D|E],
+    D=[C],
+    A=[A],
+    dif(A,[D]),
+
+    \+ E=[]
+)).
+
 main :-
     findall(test(Name, Goal), test(Name, Goal), Tests),
     run_tests(Tests, Failed),
-- 
2.54.0