From Bugzilla Helper:
User-Agent: Mozilla/4.78 [en] (X11; U; Linux 2.4.9-31 i686)

Description of problem:
Parsers generated with version 1.34 of bison cannot be compiled with C++
compilers when YYSTYPE is a class. This breaks many C++ projects that use bison.
I recommend updating the package to bison 1.35 where the problem has been fixed.
For all the gory details, see the given URL.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
An example of a project that breaks because of this:
1. Download GiNaC sources from www.ginac.de (and install CLN if you
   haven't already done so)
2. ./configure
3. rm ginsh/ginsh_parser.cc [to force a rerun of bison]
4. make


Actual Results:  Compilation in the "ginsh" directory fails with the message
/usr/share/bison/bison.simple:75: member `GiNaC::ex yyalloc::yyvs' with 
constructor not allowed in union


Expected Results:  A clean compile (as is the case with bison-1.28-7 from RedHat
7.2).


Additional info:

For all the gory details, see
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=130914&repeatmerged=yes