class A {
  int foo;
  A(this.foo);
}

typedef B = A;

class C<X, Y> {
  X x;
  Y y;
  C(this.x, this.y);
}

typedef D<X> = C<X, X>;

test1(dynamic x) {}

test2(dynamic x) {}

main() {}

expectEquals(x, y) {}