Implement BTreeMap::append

[apasel422]

No description provided.

[cshinaver]

I'd like to work on implementing this, but I was having some trouble figuring out the testing. It seems that there is a private dependency on a btree repo ( #9 ). I tried removing the dependency and running the tests, but (unsurprisingly) it didn't compile. Do the existing tests pass? Where would be the best place to get started?

[Gankra]

#9 is now fixed! \o/

[cshinaver]

Thanks @gankro and @apasel422

It seems that there is not an already existing append function for the BTreeMap. Is this supposed to mirror the extend function?

[Gankra]

It takes another collection of the same type and moves all of its elements into self. See Vec::append, LinkedList::append. It's basically an extend that can be optimized based on the fact that both collections are the same type.

[gereeter]

See rust-lang/rust#26227 for some discussion and code on implementing this. Sorry for not touching this code in quite a while - I'm very swamped right now.