Intersection api for Set

[RoDmitry]

(copy from HashSet)

[RoDmitry]

Any links that explain why ::core is inconsistent?

[udoprog]

Any links that explain why ::core is inconsistent?

It was an inconsistent across my own projects and doesn't contribute to how the code is compiled. It can sometimes be useful inside of macros if there's ambiguity.

Also, thanks for the impl!

The build was disabled due to Github policy so I was never pinged when it was completed. Since I needed to push again to re-trigger the build I decided to do a bit of cleanup at the same time.

[udoprog]

There are some more HashSet APIs that could be ported if that's something you want to take a stab at. I added the From<[T; N]> impl for Set<T> here which allows doc tests to be a bit cleaner. Otherwise I'll be baking a new release in a day or two.

The primary issue for "missing APIs" is #11.

[RoDmitry]

Not important, but I personally prefer ::core and ::std so it compiles a bit faster, like milliseconds faster, maybe which nobody would even notice 🙂