_SOURCE_EVENT_SOURCE_TYPE_INVALID  564 src/libsystemd/sd-event/sd-event.c                 return _SOURCE_EVENT_SOURCE_TYPE_INVALID;
_SOURCE_EVENT_SOURCE_TYPE_INVALID  727 src/libsystemd/sd-event/sd-event.c         s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID;
_SOURCE_EVENT_SOURCE_TYPE_INVALID 2148 src/libsystemd/sd-event/sd-event.c         case _SOURCE_EVENT_SOURCE_TYPE_INVALID: