ref: 8fef0e65ac05920b30d13ef4816dd166c3c83c47
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") }