struct A(i32);
struct B<'a>(&'a A);
struct C<'a, 'b>(&'b B<'a>);
struct D<'a, 'b, 'c>(&'c C<'a, 'b>);

fn foo() {
  `[let x = D(&C(&B(&A(0))));]`
  `[let y = x.0.0.0.0 + 1;]`
}