From: Richard M. Stallman <rms@gnu.org>
Date: Sun, 25 Jan 1998 07:20:49 +0000 (+0000)
Subject: Comment change.
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Comment change.
---

diff --git a/src/alloc.c b/src/alloc.c
index c6fb2319d1e..9b84a7e51f8 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -2006,6 +2006,9 @@ mark_object (argptr)
 	mark_object (&ptr->plist);
 	XSETTYPE (*(Lisp_Object *) &ptr->name, Lisp_String);
 	mark_object (&ptr->name);
+	/* Note that we do not mark the obarray of the symbol.
+	   It is safe not to do so because nothing accesses that
+	   slot except to check whether it is nil.  */
 	ptr = ptr->next;
 	if (ptr)
 	  {