ref: f0f00c4644ec29bc528c2b47e9ec4e284f72cccc 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 ;; }