Sorry to hear that. As far as I know the documentation should be up to date, but it's entirely possibly you've found an issue.

If you like you can hit up the mailing list (https://groups.io/g/wallaroo) or the IRC channel (#ponylang on freednode, https://webchat.oftc.net/?channels=wallaroo) to see if anybody can help, or if you think you've found a bug you can file an issue in github (https://github.com/ponylang/ponyc/issues).

UPDATE: I'm glad to hear you got it working!