ref: 5fc8fe7bec594a98c7a2b9fbdfc5f7fb4f11c7c9 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) }