If you've ever used templates in C++, you've probably gone blind trying to read the compiler errors.

grokmatch.hpp:7: error: 'typedef class std::map<std::basic_string<char,
std::char_traits<char>, std::allocator<char> >, std::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char>
> >, std::allocator<std::pair<const std::basic_string<char,
std::char_traits<char>, std::allocator<char> >, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > > > >
GrokMatch<boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const
char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >
> >::match_map_type' is private

I'm supposed to read all that crap? Especially since 99% of the data isn't useful in most cases. The following vim script sanitizes this output:

function! GPPErrorFilter()
  silent! %s/->/ARROW/g
  while search("<", "wc")
    let l:line = getline(".")
    let l:col = col(".")
    let l:char = l:line[l:col - 1]
    if l:char == "<"
      normal d%
    else
      break
    endif
  endwhile
  silent! %s/ARROW/->/g
  silent %!awk '/: In/ { print "---------------"; print }; \!/: In/ {print }'
endfunction

If I dump the output of make to a file (including stderr), and run the function while in vim, using ':call GPPErrorFilter()', the output turns into this:

g++ -g -I/usr/local/include -c -o main.o main.cpp
---------------
grokmatch.hpp: In function 'int main(int, char**)':
grokmatch.hpp:7: error: 'typedef class std::map GrokMatch::match_map_type' is private
main.cpp:43: error: within this context
make: *** [main.o] Error 1

So much better... Now i know I'm clearly trying to access a private typedef. Sanity++