class A {
  String get call => "My name is A";
}
class B {
  String Function() get call => () => "My name is B";
}
extension on ;
int (){}
extension on ;
num (){}
extension on ;
String (){}
main() {}
var topLevel1 = 1(10);
var topLevel2 = 1("10");
var topLevel3 = 1.0(10);
var topLevel4 = 1.0("10");
A a = new A();
var topLevel5 = a(2);
B b = new B();
var topLevel6 = a(2, "3");
errors() {}