On Saturday, 28 May 2022 at 01:12:38 UTC, Walter Bright wrote: > Because it did not work in general. I don't recall the > specifics, but it should be there in the discussion of it. `C++'s` combination of `...` and `concept` and `index sequence` is very powerful . I hope `d` can also have it. I hope manu can continue that `dip`. I haven't seen him for a long time.