-#define set_object(x, y) internal_set_object (ly_symbol2scm (x), y)
-#define del_property(x) internal_del_property (ly_symbol2scm (x))
-
-#ifndef NDEBUG
-#define set_property(x, y) internal_set_property (ly_symbol2scm (x), y, __FILE__, __LINE__, __FUNCTION__)
-#else