Are there any exercises/challenges for D?

[bearophile via Digitalmars-d-learn]

maik klein:

> Are there any exercises/challenges for D?
>
> Something like this? 
> http://www.haskell.org/haskellwiki/99_questions/1_to_10

This is an interesting question. There are many 
exercises/challenges that can be done in D, but I don't know any 
specific for D. As D challenge I suggest to write a useful Phobos 
pull request, there are many many missing useful functions.

Bye,
bearophile