ref: cde7e0d999cf3d56f48d830cf3149f779d86fb31
dir: /test/genericmake.myr/
use std type t(@ty) = union `Some @ty `None ;; const make = {v -> `Some v } const main = { var x x = make(123) match x | `std.Some v: std.put("val = {}\n", v) | `std.None: std.die("Unreachable\n") ;; }