[luikore]

D is more like C++ without macro and with GC plus some engineering features (unit test is a language feature? weird). Rust looks different and does different. For example, idiomatic foreach block in Rust is a syntax sugar of passing lambda, which is more friendly to parallelism. While in C++/D it is a syntax sugar of classic for-loop with iterator, which is more efficient in unparalleled environment.

[dbaupp]

> For example, idiomatic foreach block in Rust is a syntax sugar of passing lambda, which is more friendly to parallelism

This changed with the recent 0.8, `for` is now syntax sugar for using the Iterator trait, which optimises exactly like C++ (the vector iterator even vectorises when LLVM can do it).

Rust has actually moved to have iterators that are very similar to (a subset of) D's ranges.

[WalterBright]

You might thing that unit test as a language feature is weird. But our experience with it is that minor-seeming weird feature has been an enormous success.

It has literally transformed writing D code, and for the better. There's another little feature, -cov, which will tell you which lines of code are covered by the unit tests.

It's hard to understate the improvement these engender.