         case ZeroLengthVariable
         
         // Resolution Errors
-//        case CannotParseHexNumber
-//        case CannotParseOctalNumber
         case CannotParseLocalizedNumber
         case UnknownOperator
         case AmbiguousOperator

        case InvalidArguments
    }
    
    
    public let kind: Kind
    public let range: Range<String.Index>
}


    public enum Kind {
        // Tokenization Errors
        case CannotParseNumber
        case CannotParseHexNumber // can also occur during Resolution
        case CannotParseOctalNumber // can also occur during Resolution
        case CannotParseExponent
        case CannotParseIdentifier
        case CannotParseVariable
