Antlr 3.5 lexer produces code that cannot be compiled in C#

in Antlr 3.4 generating a lexer to C# produces correct code

``` C#
        private const string DFA30_minS =
            "\x2\x2E\x3\xFFFF";
```

In Antlr 3.5 it seems incorrect

``` C#
        private const string DFA30_minS =
            "\2\56\3\uffff";
```

The numbers seem to be octal and anyway it doesn't compile
(code generated using ANTLRWorks 1.5)
