Issue 4459/1: Mark mark_smob () member functions as const

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

diff --git a/lily/include/listener.hh b/lily/include/listener.hh
index 6f8995c64e88d134406abab2a799c9b527a67e37..00a64eebb892db03b4231cb983e413c9a4051d34 100644 (file)
--- a/lily/include/listener.hh
+++ b/lily/include/listener.hh
@@ -108,7 +108,7 @@ public:
     return SCM_UNSPECIFIED;
   }
 
-  SCM mark_smob ()
+  SCM mark_smob () const
   {
     scm_gc_mark (callback_);
     return target_;