From 887db2ff38ce82bb5f33aa128c76b578caba216d Mon Sep 17 00:00:00 2001
From: Pip Cet <pipcet@protonmail.com>
Date: Tue, 17 Jun 2025 15:19:41 +0000
Subject: [PATCH] Avoid inconsistent item size problems (bug#78812)

* src/igc.c (igc_xpalloc_lisp_objs_exact): Assert item_size covers
precisely one Lisp_Object, until the code is fixed.
---
 src/igc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/igc.c b/src/igc.c
index 2b9339d0c99..aae12975535 100644
--- a/src/igc.c
+++ b/src/igc.c
@@ -3508,6 +3508,7 @@ igc_xpalloc_lisp_objs_exact (Lisp_Object *pa, ptrdiff_t *nitems,
 			     ptrdiff_t nitems_incr_min, ptrdiff_t nitems_max,
 			     ptrdiff_t item_size, const char *label)
 {
+  igc_assert (item_size == word_size);
   ptrdiff_t nitems_old = *nitems;
   ptrdiff_t nitems_new = nitems_old;
   ptrdiff_t nbytes