From 48cea6efdfd17b5661cec5c04813889c5bac744f Mon Sep 17 00:00:00 2001
From: Markus Triska <triska@metalevel.at>
Date: Wed, 1 Dec 2021 20:58:38 +0100
Subject: [PATCH] FIXED: retract/1 issues due to module qualification

This addresses #1125.
---
 src/lib/builtins.pl | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/lib/builtins.pl b/src/lib/builtins.pl
index e3bd22a6..00a26238 100644
--- a/src/lib/builtins.pl
+++ b/src/lib/builtins.pl
@@ -998,14 +998,14 @@ retract_clause(Head, Body) :-
 
 :- meta_predicate retract(0).
 
-retract(Clause) :-
-    (  Clause \= (_ :- _) ->
-       Head = Clause,
-       Body = true,
-       retract_clause(Head, Body)
-    ;  Clause = (Head :- Body) ->
-       retract_clause(Head, Body)
-    ).
+retract(Clause0) :-
+    strip_module(Clause0, Module, Clause),
+    (   Clause = (Head :- Body) ->
+        true
+    ;   Head = Clause,
+        Body = true
+    ),
+    retract_clause(Module:Head, Body).
 
 
 :- meta_predicate retractall(0).
-- 
2.54.0