+ string f = ly_scm2string (format);
+
+ string output_name = "<unknown>";
+
+ SCM port_name = scm_port_filename (port);
+ if (scm_is_string (port_name))
+ output_name = ly_scm2string (port_name);
+
+ message (_f ("Layout output to `%s'...",
+ output_name.c_str ()));