1 // { dg-do compile { target c++11 } } 2 3 int operator""_t (long long unsigned); // { dg-message "note: candidate"} 4 5 namespace foo { 6 int operator""_t (long long unsigned); // { dg-message "note: candidate"} 7 } 8 9 using namespace foo; 10 int var = 10_t; // { dg-error "call of overloaded | is ambiguous" } 11