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#include <type_traits>
 
struct foo {};
struct bar : foo {};
struct qux : foo {};
 
int main() {
    std::common_type<qux, bar>::type x;
}

In file included from prog.cpp:1:0:
/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/type_traits: In instantiation of 'std::common_type<qux, bar>':
prog.cpp:8:31:   instantiated from here
/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/type_traits:604:64: error: no match for ternary 'operator?:' in 'true ? std::declval [with _Tp = qux, typename std::add_rvalue_reference<_Tp>::type = qux&&]() : std::declval [with _Tp = bar, typename std::add_rvalue_reference<_Tp>::type = bar&&]()'

Standard output is empty