On Wed, Mar 31, 2010 at 11:20 AM, Anton Bychkov <[email protected]>wrote:

> Hi.
>
> The following grammar does not generate target code.
> It says "error(139): skipper.g: set complement is empty".
>

Try adding the lexer rules:

LParen : '(';
RParen : ')';

Regards,

Bart.

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