Shared via Pony Playground (https://playground.ponylang.io/?gist=3a90c3b0fa47484d10e4a7e6f9267e5b)

main.pony

actor Main
  let foo: Foo
  new create(env: Env) =>
    try
      foo = Foo()?
    else
      env.err.print("Something went wrong!")
      env.exitcode(1)
    end

class Foo
  new create() ? => None