Created attachment 327426 [details]
trivial test-case

On F-10

g++ test.cxx
g++ -fno-exceptions test.cxx

works fine

on rawhide now

g++ test.cxx
works, but
g++ -fno-exceptions test.cxx
will crap out with 

In file included from /usr/include/boost/function/detail/maybe_include.hpp:13,
                 from /usr/include/boost/function/detail/function_iterate.hpp:14,
                 from /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:47,
                 from /usr/include/boost/function.hpp:64,
                 from test.cxx:1:
/usr/include/boost/function/function_template.hpp:965: error: declaration of ‘class R’
/usr/include/boost/function/function_template.hpp:652: error:  shadows template parm ‘class R’
/usr/include/boost/function/function_template.hpp:979: error: declaration of ‘class R’
/usr/include/boost/function/function_template.hpp:652: error:  shadows template parm ‘class R’
/usr/include/boost/function/function_template.hpp:983: error: invalid use of incomplete type ‘class boost::function0<R>’
/usr/include/boost/function/function_template.hpp:667: error: declaration of ‘class boost::function0<R>’
/usr/include/boost/function/function_template.hpp:994: error: declaration of ‘class R’
/usr/include/boost/function/function_template.hpp:652: error:  shadows template parm ‘class R’
/usr/include/boost/function/function_template.hpp:1000: error: ‘void boost::function0<R>::operator==(const boost::function0<R>&, const boost::function0<R>&)’ must take exactly one argument
/usr/include/boost/function/function_template.hpp:1001: error: declaration of ‘class R’
/usr/include/boost/function/function_template.hpp:652: error:  shadows template parm ‘class R’
/usr/include/boost/function/function_template.hpp:1007: error: ‘void boost::function0<R>::operator!=(const boost::function0<R>&, const boost::function0<R>&)’ must take exactly one argument
/usr/include/boost/function/function_template.hpp:1017: error: declaration of ‘class R’
/usr/include/boost/function/function_template.hpp:652: error:  shadows template parm ‘class R’
/usr/include/boost/function/function_template.hpp:1025: error: ‘struct boost::function<R ()()>::clear_type’ redeclared with different access
/usr/include/boost/function/function_template.hpp:1098: error: ‘class boost::function<R ()()>’ redeclared with different access
In file included from /usr/include/boost/function/detail/maybe_include.hpp:18,
                 from /usr/include/boost/function/detail/function_iterate.hpp:14,
                 from /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:52,
                 from /usr/include/boost/function.hpp:64,
                 from test.cxx:1:
/usr/include/boost/function/function_template.hpp:80: error: expected unqualified-id before ‘namespace’
test.cxx:6: error: expected `}' at end of input