Enum for token '0', EOF

[Frans Englich]

I am using a hand-written tokenizer unfortunately(would be more practical to 
use Flex), and is using yytokentype in order to increase type safety of the 
code.

A problem arrives when I need to return EOF, the '0' token. It requires me to 
engage in static_cast'ing 0 to yytokentype, which is ugly and error prone.

Is there any clean solution to this on the Bison side? E.g, can I somehow 
generate a token(such as with %token) for EOF?


Cheers,

                Frans