From 64f425990488ff9b49a4322f7fb1c7801f109418 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 21 Jan 2024 20:34:03 -0800
Subject: [PATCH] Add an eassert back to XSYMBOL
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Problem reported by Alan Mackenzie in:
https://lists.gnu.org/r/emacs-devel/2024-01/msg00755.html
* src/lisp.h (XSYMBOL): If the arg is not a bare symbol, then
eassert (symbols_with_pos_enabled).  This shouldn’t affect code
generated for regular builds, and could catch caller errors in
debug builds.  For debug builds although this slows things down
XSYMBOL should still be faster than it was the day before
yesterday, as there’s still no need to eassert (SYMBOLP	(a)).

(cherry picked from commit 088afa7e2f08f4eb4e39aae5db4faa33857bf544)
---
 src/lisp.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/lisp.h b/src/lisp.h
index 29d2a08785a..efdb3886141 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -1161,7 +1161,12 @@ XBARE_SYMBOL (Lisp_Object a)
 INLINE struct Lisp_Symbol * ATTRIBUTE_NO_SANITIZE_UNDEFINED
 XSYMBOL (Lisp_Object a)
 {
-  return XBARE_SYMBOL (BARE_SYMBOL_P (a) ? a : XSYMBOL_WITH_POS (a)->sym);
+  if (!BARE_SYMBOL_P (a))
+    {
+      eassert (symbols_with_pos_enabled);
+      a = XSYMBOL_WITH_POS (a)->sym;
+    }
+  return XBARE_SYMBOL (a);
 }
 
 INLINE Lisp_Object
-- 
2.39.5