Comment 2 for bug 850549

StacktraceTop:
 size (this=0x7f60fc186f58) at /usr/include/c++/4.5/bits/basic_string.h:702
 compare (__str=..., this=0x7f60fc186f58) at /usr/include/c++/4.5/bits/basic_string.h:2132
 operator< <char, std::char_traits<char>, std::allocator<char> > (__rhs=..., __lhs=...) at /usr/include/c++/4.5/bits/basic_string.h:2419
 operator() (__y=..., __x=..., this=<optimized out>) at /usr/include/c++/4.5/bits/stl_function.h:230
 std::_Rb_tree<std::string, std::pair<std::string const, std::string>, std::_Select1st<std::pair<std::string const, std::string> >, std::less<std::string>, std::allocator<std::pair<std::string const, std::string> > >::_M_insert_unique_ (this=0x7f60fc186f30, __position=..., __v=...) at /usr/include/c++/4.5/bits/stl_tree.h:1240