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geobei (2) [Avatar] Offline
The mixin example 8.21 (EvenSieve ...) fails as type information of the returned this refers to the mixin class.
This can be avoided by coercing this to another type that is only compatible to the mixin target type. So obviously
return (this as List)
works, but reduces usability of mixin classes to List.
More generally, the following work also:
return (this as Collection)
and even
return (this as Serializable)
Mittie (397) [Avatar] Offline
Thanks for posting.

I'm not quite sure which Groovy version you tested with but the code (now listing 8.22) works fine with Groovy 2.4.

keep groovin'