GC-related fix of volta-repeat-iterator

This problem was introduced with issue 355.

diff --git a/lily/volta-repeat-iterator.cc b/lily/volta-repeat-iterator.cc
index 110053686fd2ed6bb4479eca653567e237a9cae6..e9b858de3991a9e7e4848ecacd677847ab3f2623 100644 (file)
--- a/lily/volta-repeat-iterator.cc
+++ b/lily/volta-repeat-iterator.cc
@@ -53,6 +53,7 @@ void
 Volta_repeat_iterator::derived_mark () const
 {
   scm_gc_mark (alt_restores_);
+  Sequential_iterator::derived_mark ();
 }
 
 SCM