struct IfExpr {
}

struct MatchExpr {
}

type Expr = IfExpr | MatchExpr

fn sum_types(a []Expr) {
}

fn main() {
	x := 0xdead_beef
	u := 9_978_654_321
	o := 0o66_4
	eprintln('  hex constant in decimal: ${x}')
	eprintln('    u constant in decimal: ${u}')
	eprintln('octal constant in decimal: ${o}')
}