ref: 27d6ae05d6408b4b2c9fb6b58799f503ddb1b6d6 dir: /test/genericmatch.myr/
use std type t(@a) = union `Foo @a `Bar ;; const main = { match `Foo 123 `Foo a: -> 0xf;; `Bar: -> 0x0;; ;; }