question: f0 - > '' , '' f1 - > formalparameter concode_field_sep PlaceHolder placeHolder concode_field_sep placeholderType placeHolder
target: void function ( FormalParameterRest arg0 , A arg1 ) { arg0 . f0 . accept ( this , arg1 ) ; arg0 . f1 . accept ( this , arg1 ) ; }