ref: 30ae6dbd5eb7c7f8c9c76a32723dd33c5f90978b dir: /test/stdopt-mk.myr/
use std const f = {x if x == 123 -> `std.Some 42 else -> `std.None ;; } const main = { var v v = f(123) match v `std.Some x: -> x;; `std.None: -> 123;; ;; }