ref: 6440e9bb365a29f2a7062f8bdf8dd3d5b8229cf1 dir: /test/genericret.myr/
use std type t(@a) = union `Val @a `None ;; const f = {-> t(int) -> `None } const main = { match f() | `None: std.exit(42) ;; std.exit(0) }