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I'd venture to say.. Prolog and Shen. Specifically, I am implementing a modern Prolog in Rust that will encompass the results of some more recent (ie. current century) research within the logic programming/Prolog community. It's here:

http://github.com/mthom/rusty-wam

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Is this more about new language constructs or a better run-time execution/solver ?

New language constructs. The 'WAM' in the name refers to the Warren Abstract Machine, one of the more efficient ways to implement Prolog in a procedural language.

Also, using the SICStus interface and semantics for attributed variables should make for some very general constraint solvers, yes.

What do you think about answer-set programming vs more general solvers like SICStus.

I don't know enough about answer set programming to give much of an answer. Sorry.

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