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How far along is the effort for efficient code reuse (such as filling the gaps of lack of inheritance)?

I.e. this:

Is it something coming soon, or it's pretty far still?

Specialization would only be one piece of the puzzle, and as you can see, it's not in stable yet.

All of the bits are still too far out to give a good estimate of.

Thanks. Do you expect that to introduce some non backward compatible changes to language (and for example require a new major version)?

I do not, no, and I would suspect that it'd be a non-starter if it did require it.

Great, thanks!

Initial work on specialization has already landed on nightly and is backwards compatible. AFAIK, there are no plans to break that.

That's good!