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Golang: Easy concurrency using go-routines, a (comparatively) good minimal latency GC, an excellent comprehensive and stable standard library and few bugs.

Dlang: Traditional concurrency (thread based), great generics implementation, nice algorithm/container libraries and C++ interop

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Actually the standard libraries containers (In D) are fairly poor/ignored. Also concurrency in D is not traditional in the way you seem to imply: Immutability and message passing are the recommended way to do it, Fibers are also in the standard library.

Actually, D suports "fibers" where you have a "Task". Then you can switch the task handler to another implementation and have Go-like M:N coroutines. The default handlers in the stdlib are only thread based or single-thread coroutines but Vibe.d for example supports Go-like coroutines.

Still, Go is really hard to beat on that front because it makes it super easy and has the really brilliant feature of making almost everything that waits for IO interruptable inside a function when you call "go function()" without having to mark operations with "async".

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