Testing functions for equality

Here’s an example of testing top-level functions, static methods, andinstance methods for equality:

void foo() {} // A top-level function
class A {
  static void bar() {} // A static method
  void baz() {} // An instance method
}
void main() {
  var x;
  // Comparing top-level functions.
  x = foo;
  assert(foo == x);
  // Comparing static methods.
  x = A.bar;
  assert(A.bar == x);
  // Comparing instance methods.
  var v = A(); // Instance #1 of A
  var w = A(); // Instance #2 of A
  var y = w;
  x = w.baz;
  // These closures refer to the same instance (#2),
  // so they're equal.
  assert(y.baz == x);
  // These closures refer to different instances,
  // so they're unequal.
  assert(v.baz != w.baz);
}