* VERSION (MY_PATCH_LEVEL): make 1.7.0

[lilypond.git] / lily / include / spanner.hh

diff --git a/lily/include/spanner.hh b/lily/include/spanner.hh
index c146182f178807a527ddd34945d5e70040b16e13..e56560744e51b6d08c038e19b285a54e8156b475 100644 (file)
--- a/lily/include/spanner.hh
+++ b/lily/include/spanner.hh
@@ -55,7 +55,7 @@ public:
 
   static int compare (Spanner * const &,Spanner * const &);
   virtual Grob* find_broken_piece (System*) const;
-  virtual SCM do_derived_mark ();
+  virtual SCM do_derived_mark () const;
   static bool has_interface (Grob*);
   virtual System *get_system () const;
 protected: