gcc/testsuite/g++.old-deja/g++.brendan/operators1.C

// { dg-do assemble  }
// GROUPS passed operators
struct A {
	int x;
};

int operator()(A x,float y) { // MUST be a member function// { dg-error "" } .*
	return 1;
}

int main() {
	A x;
	x(1.0); // { dg-error "" } no match for call
}