ref: 68b18a7fba8313ad5b1d8b4c6be61e3b8b126304 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) }