Wrong error message

[DariuszDepta]

Hi all,

I guess, in this line

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        use Error::*;

        match *self {
            TooLong(len) => write!(f, "hrp is too long, found {} characters, must be <= 126", len),  // <--- HERE
            Empty => write!(f, "hrp is empty, must have at least 1 character"),
            NonAsciiChar(c) => write!(f, "found non-ASCII character: {}", c),
            InvalidAsciiByte(b) => write!(f, "byte value is not valid US-ASCII: \'{:x}\'", b),
            MixedCase => write!(f, "hrp cannot mix upper and lower case"),
        }
    }
}

a previously defined constant should be used, like:

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        use Error::*;

        match *self {
            TooLong(len) => write!(f, "hrp is too long, found {} characters, must be <= {}", len, MAX_HRP_LEN),
            Empty => write!(f, "hrp is empty, must have at least 1 character"),
            NonAsciiChar(c) => write!(f, "found non-ASCII character: {}", c),
            InvalidAsciiByte(b) => write!(f, "byte value is not valid US-ASCII: \'{:x}\'", b),
            MixedCase => write!(f, "hrp cannot mix upper and lower case"),
        }
    }
}

Currently, such an error is reported when the prefix is too long:
hrp is too long, found 85 characters, must be <= 126
which is somewhat confusing ;-).