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I like to know whether this language support these stuffs.

- C++ level of const correctness or a simple way to make immutable data structure. Or immutable view of full data structure.

- Explicit symmetric coroutine with safe data sharing machinery. I mean something like Erlang process or Goroutine.

- Any meta-programming facility such as macro or template.

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1. Yes 2. No 3. A bit. Not macros or templates but nonetheless you can do some type of meta programming with reflection.

Do you plan to add macros or some other kind of compile-time metaprogramming? I think it's important to have that, since reflection is at odds with obfuscation and also introduces runtime overhead compared to compile-time code generation.

Many ideas of this sort are flying around, but we postpone the decision to some time after 1.0

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