Implementing Pure Functions (in D)

I've played around with it and bought Alexandrescu's book. It's an elegant language and in theory easier than C++ to work with (faster compilation times, better error messages, more concise and expressive syntax). But the tooling and library support is not too good. There is also a fractured community over the move from D 1.0 to 2.0, which broke compatibility. I really do hope it becomes mainstream though - it addresses in a straight-forward way many C++ headaches that you have to be a C++ expert and/or contortionist (such as Alexandrescu) to solve. It really just needs a killer app or library to drive adoption.