> Can you explain what 'empty' is?
>
> The usual way to write optional rules is
>
> X_opt :
> | X
>
> In this situation, 'p[0] = p[1]' will fail in the case of the empty
> alternative.
>
'empty' is the construct defined as:
def p_empty(self, p):
'empty : '
p[0] = None
It's recommended for use by Dave in the PLY documentation.
Eli
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