Merge remote-tracking branch 'origin/release/unstable' into staging

[lilypond.git] / lily / staff-symbol-engraver.cc

diff --git a/lily/staff-symbol-engraver.cc b/lily/staff-symbol-engraver.cc
index a726f213253f28dbc9022ae3754d97775c4fa435..1ca6a4dce1f57ad256f472bba2c0eda6a960a602 100644 (file)
--- a/lily/staff-symbol-engraver.cc
+++ b/lily/staff-symbol-engraver.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -46,8 +46,19 @@ protected:
   DECLARE_TRANSLATOR_LISTENER (staff_span);
   virtual void finalize ();
   void process_music ();
+  virtual void derived_mark () const;
 };
 
+void
+Staff_symbol_engraver::derived_mark () const
+{
+  for (LEFT_and_RIGHT (d))
+    {
+      if (span_events_[d])
+        scm_gc_mark (span_events_[d]->self_scm ());
+    }
+}
+
 Staff_symbol_engraver::~Staff_symbol_engraver ()
 {
   if (span_)