Interface Covariance Bug?

[Stewart Gordon]

John C wrote:
> "Walter Bright" <newshound at digitalmars.com> wrote in message 
> news:e09vmu$2ubc$1 at digitaldaemon.com...
>> It's a forward reference problem. Try reversing the declarations of keys() 
>> and KeyCollection.
> 
> Thanks - that fixed it.
> 
> But surely it highlights a separate bug: forward referencing isn't supposed 
> to be an issue in D, is it?

Looking at your code again, it appears to be a case of

http://d.puremagic.com/bugzilla/show_bug.cgi?id=65

I've just noticed that my testcase contains a forward reference as well. 
   Guess I'll have to try rewriting it without the forward reference and 
see what happens.

Stewart.

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