ref: fcb38bff6b06d23a3499bd13bc683754cb10dec0
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 {}\n", x) ;; ;; std.put("\n") }