ref: bc3a2a3b871d3126de301b51fd58c452c4ef5ead
dir: /test/nestucon.myr/
use std
type t = struct
	x : union
		`Int int
		`Str byte[:]
	;;
;;
const main = {
	var a : t
	a = [.x = `Str "asdf"]
	match a
	| [.x=`Str s]:	std.put("{}\n", s)
	| _:	std.die("Impossible match failure\n")
	;;
}