X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;ds=sidebyside;f=lily%2Finstrument-switch-engraver.cc;h=8bd364646c58af80b5089ef388f34b70f9c00f56;hb=e27f4adb184e30ee9202255a4d9807dd56dad3e1;hp=589bb051452acf1aef8da687e45fd0902525de66;hpb=b7a0cffbf9d1069860368f289a5b50e9d1d90ba8;p=lilypond.git

diff --git a/lily/instrument-switch-engraver.cc b/lily/instrument-switch-engraver.cc
index 589bb05145..8bd364646c 100644
--- a/lily/instrument-switch-engraver.cc
+++ b/lily/instrument-switch-engraver.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 2006--2009 Han-Wen Nienhuys <hanwen@lilypond.org>
+  Copyright (C) 2006--2010 Han-Wen Nienhuys <hanwen@lilypond.org>
 
 
   LilyPond is free software: you can redistribute it and/or modify
@@ -21,6 +21,7 @@
 #include "engraver.hh"
 #include "item.hh"
 #include "text-interface.hh"
+
 #include "translator.icc"
 
 
@@ -34,8 +35,15 @@ protected:
 
   void stop_translation_time_step ();
   void process_music ();
+
+  virtual void derived_mark () const;
 };
 
+void
+Instrument_switch_engraver::derived_mark () const
+{
+  scm_gc_mark (cue_name_);
+}
 
 Instrument_switch_engraver::Instrument_switch_engraver ()
 {
@@ -50,7 +58,7 @@ void
 Instrument_switch_engraver::process_music ()
 {
   SCM cue_text = get_property ("instrumentCueName");
-  
+
   if (!scm_is_eq (cue_name_, cue_text))
     {
       if (Text_interface::is_markup (cue_text))