         }
 
         do {
-            var csv = try CSV(string: str,
+            let csv = try CSV(string: str,
                               hasHeaderRow: true,
                               trimFields: false,
                               delimiter: ",")


        do {
            let stream = InputStream(data: data16)
            var csv = try CSV(stream: stream,
                              codecType: UTF16.self,
                              endian: .big,
                              hasHeaderRow: true,


        do {
            let stream = InputStream(data: data8)
            let csv = try CSV(stream: stream,
                              codecType: UTF8.self,
                              hasHeaderRow: true,
                              trimFields: false,
