struct Foo {}

type Alias = Foo

type SumType = Alias | int

fn main() {
	_ = '${[1]:x}'
	_ = '${[1]!:x}'
	_ = '${Foo{}:x}'
	_ = '${[1]:f}'
	_ := '${none:F}'
	_ = '${{"a": "b"}:x}'
	_ = '${Alias(Foo{}):x}'
	_ = '${SumType(int(5)):o}'
}