"\n"
" @var{callback} should take exactly one argument." )
{
- SCM_ASSERT_TYPE (ly_is_procedure (callback), callback, SCM_ARG1, __FUNCTION__, "procedure");
+ LY_ASSERT_TYPE (ly_is_procedure, callback, 1);
Scheme_listener *l = new Scheme_listener (callback);
SCM listener = GET_LISTENER (l->call).smobbed_copy ();
l->unprotect ();