ref: 124f45afc8c465541deec8b7775dff2d91f702c6
dir: /test/fmtalign.myr/
use std pkg = type msg = union `Tversion tversion ;; type tversion = struct tag : uint16 version : byte[:] ;; ;; const main = { var msg=`Tversion [.tag=45, .version="9P2000"] std.put("{}\n", msg) }