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digitalmars.D.learn - Delegate covariance and contravariance

Hello.
I think that the delegate covariance and contravariance makes D better.
(ref. http://d.puremagic.com/issues/show_bug.cgi?id=3180)
What do you think?

I am not good at English.
So, I cannot explain this to Walter well...
Oct 15 2009