Introduce Two-ended Comparison

[amab8901]

In Python, you can write two-ended comparison as 50 < x < 100, but in Rust this simple syntax doesn't work and you instead have to write 50 < x && x < 100. I think we should introduce the former syntax to Rust since it's more readable and concise. The implementation shouldn't be too hard since I imagine you could just tell the compiler that the former syntax is synonymous with the latter syntax.

[petar-dambovaliev]

More readable to whom? Python programmers?
It's not more readable to me.

[kennytm]

duplicate of #2083.

[fmease]

Closing as duplicate then.