That patch broke Bison bootstrapping, since it breaks the calc++ example. To reproduce the problem, check out a fresh version of Bison from CVS, run ./bootstrap, ./configure, make.
Here are the symptoms: make[4]: Entering directory `/home/eggert/src/gnu/bison-tmp/examples/calc++' if g++ -DHAVE_CONFIG_H -I. -I. -I../.. -g -O2 -MT calc++-scanner.o -MD -MP -MF ".deps/calc++-scanner.Tpo" -c -o calc++-scanner.o calc++-scanner.cc; \ then mv -f ".deps/calc++-scanner.Tpo" ".deps/calc++-scanner.Po"; else rm -f ".deps/calc++-scanner.Tpo"; exit 1; fi ./calc++-parser.hh:121: error: 'driver_yyarg' has not been declared ./calc++-parser.hh:281: error: ISO C++ forbids declaration of 'driver' with no type ./calc++-parser.hh:281: error: declaration of 'int yy::calcxx_parser::driver' ./calc++-parser.hh:280: error: conflicts with previous declaration 'calcxx_driver& yy::calcxx_parser::driver'
