question: create an injected child actor . concode_field_sep PlaceHolder placeHolder concode_field_sep ActorContext context
target: ActorRef function ( Supplier < Actor > arg0 , String arg1 , Function < Props , Props > arg2 ) { return context ( ) . actorOf ( arg2 . apply ( Props . arg0 ( Actor . class , arg0 :: get ) ) , arg1 ) ; }