(Fmarker_buffer): Make test for odd case into a failure.

diff --git a/src/marker.c b/src/marker.c
index a57dafa3f3b2ac00d4c6a533722cadba566a4857..0c89f71d79ab0292b2ec3c19fc883960ec2fa28d 100644 (file)
--- a/src/marker.c
+++ b/src/marker.c
@@ -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;
 }