ref: b23b5b3f9a003382d092089ce00104be3cfddd9a
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.die("Impossible match failure\n"); ;; std.exit(0) }