bump slab to 0.4

[ignatenkobrain]

No description provided.

[carllerche]

Thanks for the PR. It doesn't look like CI is happy with it. However, since slab is only used in deprecated code (I think), maybe it isn't worth trying to update the crate?

[ignatenkobrain]

Okay, seems that many crates depend on slab 0.3, so I will create additionalversion of that in Fedora.

[ignatenkobrain]

But it would be still nice to update it, because tokio-core requires slab0.4 and mio which requires slab0.3..

[ignatenkobrain]

@carllerche so the new version of mio didn't remove dependency and it is blocking me from packaging mio in Fedora... So I spent some time and ported it.. Please review this PR ;)

[carllerche]

I only did a quick skim, but it seemed at a glance that the change is more extensive than I think it should be.

At the very least, it looks like it is removing public types, which cannot be done in patch releases.

I would ask that all public types stay and the diff be reduced to the minimum necessary to bump the version.

[carllerche]

I only did a quick skim, but it seemed at a glance that the change is more extensive than I think it should be.

At the very least, it looks like it is removing public types, which cannot be done in patch releases.

I would ask that all public types stay and the diff be reduced to the minimum necessary to bump the version.

[carllerche]

Why is this removed?

[briansmith]

@ignatenkobrain Any chance that you could update this? If not, do you mind if I take it over?

[carllerche]

Thanks for the initial work. These changes have landed as part of #824.