Merge from emacs--rel--22

[gnu-emacs] / src / marker.c

diff --git a/src/marker.c b/src/marker.c
index 31849782f6c2cc946bbf532d94519b2c432bef59..0c89f71d79ab0292b2ec3c19fc883960ec2fa28d 100644 (file)
--- a/src/marker.c
+++ b/src/marker.c
@@ -6,7 +6,7 @@ This file is part of GNU Emacs.
 
 GNU Emacs is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
+the Free Software Foundation; either version 3, or (at your option)
 any later version.
 
 GNU Emacs is distributed in the hope that it will be useful,
@@ -452,9 +452,12 @@ Returns nil if MARKER points into a dead buffer.  */)
   if (XMARKER (marker)->buffer)
     {
       XSETBUFFER (buf, XMARKER (marker)->buffer);
-      /* Return marker's buffer only if it is not dead.  */
-      if (!NILP (XBUFFER (buf)->name))
-       return buf;
+      /* If the buffer is dead, we're in trouble: the buffer pointer here
+        does not preserve the buffer from being GC'd (it's weak), so
+        markers have to be unlinked from their buffer as soon as the buffer
+        is killed.  */
+      eassert (!NILP (XBUFFER (buf)->name));
+      return buf;
     }
   return Qnil;
 }