Consider including HAMT about collect-rs

[michaelwoerister]

I'll get back to you after I've found the time to bring the code up-to-date.

[reem]

@michaelwoerister If you are busy, I'm looking for some cool data-structures stuff to do and would love to take a look at this and bring it up-to-date.

[michaelwoerister]

Sure, feel free to take a look at it.

[Ericson2314]

I've always felt being able to do a HAMT (with the bit flags and precisely-sized node) without any unsafe stuff would be a cool accomplishment for Rust, and DST in particular. We aren't there yet, but hopefully we will be someday. Just figured I'd drop this here as this is the first time I've seen anybody else talk about HAMTs in Rust.