ref: 6db6735df5f0e8d44c591c0ff8130c47f94c5d37 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) }