[bulte-rs]

Lot's of libraries for this on Github; everone (myself included; plug: https://github.com/bulters/readyset) and his mother probably writes one at some point.

[binarycrusader]

As I said, I really want to see it in the core language. Your point about "everone ... and his mother probably writes one at some point" seems like a strong point for just putting it into the language or primary implementation if it's such a common pattern.

[bulte-rs]

I fully agree in this case. But am hestitant to call for the same treatment of e.g. A web framework.

Question to answer then is: Where does the plumbing stop and the kitchen begin?

[binarycrusader]

In my opinion, we're talking about data types / data structures, which neatly avoids that discussion :-)