ref: 41a66f79ac8284bbffb9820deb8655b6bdda1c9b dir: /libstd/try.myr/
use "option.use" use "fmt.use" pkg std = generic try : (v : option(@a) -> @a) ;; generic try = {v match v | `Some x: -> x | `None: fatal("expected `Some @a, got `None\n") ;; }