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end token in rules, %type, %printer, or %destructor

From: Joel E. Denny
Subject: end token in rules, %type, %printer, or %destructor
Date: Fri, 7 Jul 2006 22:44:02 -0400 (EDT)

If the user declares his own end token (token 0), should Bison allow him 
to put it in a grammar rule?  Currently, it does.

Should Bison allow the user to declare a %type, %printer, and %destructor 
for the end token?  Currently, it does.  However, until we figure out 
whether glr.c really needs to pop the end token twice while yacc.c doesn't 
pop it at all, I think we should disallow these.

For now, I'm planning to prevent the default %printer and %destructor from 
being used for the end token... whether the user declares the end token or 


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