From 71a1d5e52c4e2e746486baa9f0df3a6603ffe8d3 Mon Sep 17 00:00:00 2001
From: ydah <t.yudai92@gmail.com>
Date: Tue, 1 Sep 2026 23:42:37 +0900
Subject: [PATCH] relation: clear digraph scratch pointers

---
 src/relation.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/relation.c b/src/relation.c
index ae4d3c516..0ab230a6e 100644
--- a/src/relation.c
+++ b/src/relation.c
@@ -118,9 +118,11 @@ relation_digraph (relation r, relation_node size, bitsetv function)
       traverse (i);
 
   free (indexes);
+  indexes = NULL;
   free (vertices);
-
-  function = F;
+  vertices = NULL;
+  R = NULL;
+  F = NULL;
 }