* src/marker.c (Fcopy_marker): Make the first arg optional.

diff --git a/src/ChangeLog b/src/ChangeLog
index b5a236ca91a1093d0a30d563809c052dd110af26..175c149f52011c1cd13ef4f883855346ece83183 100644 (file)
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2010-08-30  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+       * marker.c (Fcopy_marker): Make the first arg optional.
+
 2010-08-30  Kenichi Handa  <handa@m17n.org>
 
        * composite.c (composition_update_it): Fix computing of

diff --git a/src/marker.c b/src/marker.c
index 911d2e57706701ea16a0d7056ed53300f6c5e0cb..b5ea80562df19c781cf12fc10c1a8cdcf22b0af8 100644 (file)
--- a/src/marker.c
+++ b/src/marker.c
@@ -806,16 +806,18 @@ marker_byte_position (Lisp_Object marker)
   return i;
 }
 \f
-DEFUN ("copy-marker", Fcopy_marker, Scopy_marker, 1, 2, 0,
+DEFUN ("copy-marker", Fcopy_marker, Scopy_marker, 0, 2, 0,
        doc: /* Return a new marker pointing at the same place as MARKER.
 If argument is a number, makes a new marker pointing
 at that position in the current buffer.
+If MARKER is not specified, the new marker does not point anywhere.
 The optional argument TYPE specifies the insertion type of the new marker;
 see `marker-insertion-type'.  */)
   (register Lisp_Object marker, Lisp_Object type)
 {
   register Lisp_Object new;
 
+  if (!NILP (marker))
   CHECK_TYPE (INTEGERP (marker) || MARKERP (marker), Qinteger_or_marker_p, marker);
 
   new = Fmake_marker ();