enum E0 { one(1, bar: 1), two(2, bar: 2); final int foo; final int bar; const E0(this.foo, {required this.bar}); }
enum E1<X> { one(foo: "1"), two(foo: 2); final X foo; const E1({required this.foo}); }
enum E2<X, Y, Z> { one(1, bar: "1", baz: 3.14), two("2", baz: 3.14, bar: 2), three(3.0, bar: false); final X foo; final Y bar; final Z? baz; const E2(this.foo, {required this.bar, this.baz = null}); }
main() {}