"try_*" functions and "to_vec" for arrayvec

[Soveu]

Plus, a bit of rewrite of tinyvec to use them.

[Soveu]

I'm thinking if to_vec is a good name, because it consumes the items.
Maybe into_vec could be a better choice.

[Lokathor]

Well for one thing it looks like you added no tests at all >_>

[ThatsNoMoon]

@Soveu I have a reserve (and reserve_exact) test I made before I realized you were making this PR; you could take that from my fork.

[Soveu]

From Vec::reserve_exact

Note that the allocator may give the collection more space than it requests. 
Therefore, capacity can not be relied upon to be precisely minimal. 
Prefer reserve if future insertions are expected.

So technically tests for reserve_exact should be the same as for exact, capacity() >= amount_requested
Anyway, thanks for them, @ThatsNoMoon

[Soveu]

Appveyor test died, because of matches! macro :/

[Lokathor]

ah, yeah, gotta be really strict on keeping to a minimum version im afraid.

[Soveu]

You can merge this PR (with #80) if you don't have any objections.
I'm okay with the license, it doesn't change much for me anyway 😉

[Lokathor]

okay, 80 first, then this, then we can update the 3rd PR to use reserve.

[Lokathor]

oh i forgot that i haven't reviewed this yet. I'll have to sit down and look closely later today.

In the mean time, it looks like merging #80 made some conflicts here.

[Soveu]

one conflict was because I left previously just one new line in tests/tinyvec.rs :D

[Soveu]

I am literally now sitting in github file editor, hoping that it will work 🙃

[Soveu]

Now I understand the merge conflict joke

[Soveu]

An error occurred while generating the build script. from Travis CI :(

[Lokathor]

there's already a take function in lib.rs actually

[Lokathor]

CI seems happy now. Travis is just flaky sometimes.