gcc/gcc/testsuite/g++.old-deja/g++.other/expr1.C

// { dg-do assemble  }

// Simplified from bug report by Trevor Taylor <ttaylor@powerup.com.au>

struct T {
  int operator()(int) { } // { dg-message "candidates" }
};

int main() {
  T()(); // { dg-error "match" } no such operator
}