ref: e281949b99fc3e5b9a9a49a7abaf95b36be88dde
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: std.exit(x)
| `std.None: std.exit(123)
;;
}