What’s the thing emulating so much activity around closures lately?

https://news.ycombinator.com/item?id=46228597

https://news.ycombinator.com/item?id=46259334

Also talking about the Knuth boy/man test: https://news.ycombinator.com/item?id=46020151

Not a bad thing, but that really question if there is some active micro-