extern SCM scm_handle_by_proc_catching_all SCM_P ((void *, SCM, SCM));
extern SCM scm_handle_by_message SCM_P ((void *, SCM, SCM));
extern SCM scm_handle_by_message_noexit SCM_P ((void *, SCM, SCM));
extern SCM scm_handle_by_proc_catching_all SCM_P ((void *, SCM, SCM));
extern SCM scm_handle_by_message SCM_P ((void *, SCM, SCM));
extern SCM scm_handle_by_message_noexit SCM_P ((void *, SCM, SCM));