question: protected String formatIterable ( JCDiagnostic d , Iterable < ? > it , Locale l ) { StringBuilder sbuf = new StringBuilder ( ) ; String sep = "" ; for ( Object o : it ) { sbuf . append ( sep ) ; sbuf . append ( formatArgument ( d , o , l ) ) ; sep = "," ; } return sbuf . toString ( ) ; }
target:  Format an iterable argument of a given diagnostic.