ref: 7596ee5f651a67a62de4b009d8647f5b2cf729fb
dir: /test/uconinit.myr/
use std
type u = union
`A
`B
`C int
;;
const a = [`A, `B, `C 123]
const main = {
for v in a
match v
| `A: std.put("A ")
| `B: std.put("B ")
| `C x: std.put("C %i\n", x)
;;
;;
std.put("\n")
}