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4.4.6 T2 Improvements

Possible improvements include:

Use CVS Bison
CVS Bison, i.e., the development version of Bison, provides means to release symbols during error recovery in the C++ parsers. But much work remains to be done. You may either try it, or even improve Bison itself. Contact Akim.
A more Elaborate Visitor Hierarchy
Voir spot, for an example on how the use of a clean visitor hierarchy and auxiliary functions enhances the readability, maintainability, and expressiveness of the code.
Using Generic Visitors
Andrei Alexandrescu has done a very interesting work on generic implementation of Visitors, see Modern C++ Design. It does require advanced C++ skills, since it is based on type lists, which requires heavy use of templates.
Using Visitor Combinators
Going even further that Andrei Alexandrescu, Nicolas Tisserand proposes an implementation of Visitor combinators, see Generic Visitors in C++.