$ echo  -n '{ "a" : { "b" : 3, "c" : [1,2,3] }  }[' | ./txr -l json.txr -
(v "O" ((("S" "a") ("O" ((("S" "b") ("N" "3")) (("S" "c") ("A" (("N" "1") ("N" "2") ("N" "3")))))))))
(badsyntax . "[\n")

$ echo  -n '"\u1234"' | ./txr -l json.txr -
(v "S" "\11064")
(badsyntax . "")