Shared via Pony Playground (https://playground.ponylang.io/?gist=c5f383c0e99896b418ccb8cd06b63c25)

main.pony

actor Main
  new create(env: Env) =>
    try
      let foo = Foo.create()?
      something_else(foo)
    else
      env.err.print("Something went wrong!")
      env.exitcode(1)
    end
  
  fun something_else(foo: Foo) => None

class Foo
  new create() ? => error