ref: 9b60831c7e019e9fc9f4d62d1a016d8ddd7e7a91
dir: /test/matchunion_sl.myr/
use std
/* checks pattern matching on unions with arguments.
exits with 42. */
type u = union
`Int int
`Str byte[:]
`Nil
;;
const main = {
var v
v = `Str "foo"
match v
| `Int 127: -> 42
| `Str s: std.put("%s\n", s)
| `Nil:
;;
-> 0
}