Method error

chapter19/src/main/java/com/seaofnodes/simple/Parser.java:1720–1720

(String msg)

        }

        // Next oper= character, or 0.
        // As a convenience, mark "++" as a char 1 and "--" as char -1 (65535)
        // Distinct tags for the multi-character compound operators.
        static final char SHL = 2, SAR = 3, SHR = 4;