ref: 4d8b6e9b82dedd90e92d0cb1be10e93b7e76da2c 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) }