ref: 1692dfdd9688c970e0b5fb1def9758b229bc1402
dir: /test/matchargunion.myr/
type u = union
`Int int
`Chr char
`Nil
;;
const main = {
var v
v = `Int 123
match v
`Int 127:
-> 42
;;
`Int 123:
-> 69
;;
`Chr 'a':
-> 4
;;
`Nil:
-> 6
;;
;;
}