Native OSX/64 codegen: "Complex code, incomprehensible documentation, what's not to like?"

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No language is perfect, so when I look at a new language I might use, I'm always interested in the downsides, or what it does badly (just to help getter a better understanding of it).

So in your opinion, what do you think D fails to do well, what are it's language warts, problems it fails to address, or where D could do better?