1 // PR c++/51313 2 // { dg-do compile { target c++11 } } 3 4 class ostream; 5 6 extern "C" { 7 extern int isdigit (int); 8 } 9 10 ostream& 11 operator<<(ostream&, const unsigned char*); 12 13 extern ostream cout; 14 main()15int main() 16 { 17 cout << isdigit(0); // { dg-error "invalid conversion" } 18 } 19