I see that there is a WIP PR for new style concepts. Is there an ETA for that landing?
I realize that concepts are not on the Nim 2020 Roadmap but I wish they were.
arc/orc seems very close, so there's good reason to be positive.
If I had my druthers (and I know I don't ;-) I'd prioritize stabilizing core language features and put off other tasks, like incremental compilation.