In the latest gcc 3.3 snapshot (20031201) there is a typo in the concept
checking code for the c++ stdlib function generate_n, in:
{gccroot}/libstdc++-v3/include/bits/stl_algo.h
It looks like the phrase "__typeof__(gen())" was intented to be
"__typeof__(__gen())". This problem is already fixed in the latest mainline
snapshot (20031203). 

Here is the context:

"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
$ diff -c stl_algo.h stl_algo_fix.h
*** stl_algo.h  Tue Sep 30 07:37:40 2003
--- stl_algo_fix.h      Wed Dec  3 16:55:36 2003
***************
*** 948,954 ****
        // concept requirements
        __glibcpp_function_requires(_OutputIteratorConcept<_OutputIter,
              // "the type returned by a _Generator"
!             __typeof__(gen())>)

        for ( ; __n > 0; --__n, ++__first)
        *__first = __gen();
--- 948,954 ----
        // concept requirements
        __glibcpp_function_requires(_OutputIteratorConcept<_OutputIter,
              // "the type returned by a _Generator"
!             __typeof__(__gen())>)

        for ( ; __n > 0; --__n, ++__first)
        *__first = __gen();
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""