+ /* a handleRef is allowed to exist at the time of DropReferences, but not at the time of Destroyed
+ */
+}
+
+void
+SessionHandleRef::insanity_check ()
+{
+#ifndef NDEBUG
+ cerr << string_compose (
+ _("programming error: %1"),
+ string_compose("SessionHandleRef exists across session deletion! Dynamic type: %1 @ %2",
+ PBD::demangled_name (*this), this))
+ << endl;
+#endif