Hello

I have a bison grammar file, and I would like to enable/disable certain rules 
based on a variable.

So for example:

rule1 : rule2 | rule3 | rule4
rule2: A B C
rule3: D E F rule2
rule4: rule2 | G

On a certain day I only want rule 4 disabled. Is there a possibility to do such 
a thing in bison?

Thank you,

Filip van der Meeren

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