groovy.transform.EqualsAndHashCode annotation does not handle cycles

There is now minimal support (in master and 2_1_X) to handle self-references in the generated equals(), plus the doco is updated a little to better set expectations - the annotation was never meant to cover all cases - just reduce boilerplate in the standard cases. Next up is to provide similar support in hashCode() for self-references. Then I think we could probably close this issue. I am not sure a general solution could be found for arbitrary mutually recursive data structures while still following Java conventions for the respective methods.

There is now code to handle hashCode() self-references and given the doco improvements (to better set expectations) I am going to resolve this issue. Mutual recursion isn't handled yet but I don't know any algorithms that would handle such recursion in a general way given the other conventions and constraints around these methods. If you have specific suggestions, please reopen or better still create a new issue with your proposal. Thanks.