If you ignore the null rule it'll blow your mind less if you think about it as:

A ::= B | 'hello!'
A ::=

There's no conceptual reason that the null rule couldn't be the last 
"alternative" but I believe the DSL grammar won't allow it hence it's a 
separate statement. 

On Jun 18, 2014, at 9:37, Paul Bennett <[email protected]> wrote:

>> A ::= B
>> A ::= 'hello!'
>> A ::= # empty
> 
> Point not taken. Point, in fact, blew my mind. More research is required.

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