TYPEMAP

pe_watcher *	O_WATCHER
pe_event *	O_EVENT

INPUT

O_WATCHER
	$var = ($type) sv_2watcher($arg)

O_EVENT
	$var = ($type) sv_2event($arg)

OUTPUT

O_WATCHER
	croak("use watcher_2sv($var)")

O_EVENT
	croak("use event_2sv($var)")