Add Itertools.contains

[mmirate]

This is an extremely trivial shorthand for the code-pattern suggested by the docs for slice::contains in the case when one has a slice of owned data to be queried using borrowed data.

[phimuemue]

Should we also support Borrow? - Like e.g. HashSet::get, so that we can test if an iterator over Strings contains a &str.

[mmirate]

Should we also support Borrow? - Like e.g. HashSet::get, so that we can test if an iterator over Strings contains a &str.

I believe I included an example of this in the doctests.

[jswrenn]

Thanks for the contribution!

[mmirate]

That seems to be the last of the typos and such. I hate to think how far they would have gone in a dynamic language. 😃

[jswrenn]

Thanks for this!

bors r+

[bors]

Build succeeded:

• bors build finished

[mmirate]

My pleasure. :)