Getting line information from other terminals.

[alberth]

In the scanner, all tokens get position information. In the parser however you can only get line information from a single token, namely the first one. This makes it impossible to report position for error related to other tokens.

As a trival example, consider a rule like FUNCTION code END. The END can be just as wrong as FUNCTION, and it doesn't need to be on the same line, especially if code is not short.

In the current implementation, I would have to change value of every token in the scanner to include position information, which is silly.