Auto merge of rust-lang#6296 - flip1995:rustup, r=flip1995

Rustup

r? `@ghost`

changelog: none

Fix rustup fallout

Auto merge of rust-lang#6044 - rschoon:rc-buffer, r=yaahc

Add `rc_buffer` lint for checking Rc<String> and friends

Fixes rust-lang#2623

This is a bit different from the original PR attempting to implement this type of lint.   Rather than linting against converting into the unwanted types, this PR lints against declaring the unwanted type in a struct or function definition.

I'm reasonably happy with what I have here, although I used the fully qualified type names for the Path and OsString suggestions, and I'm not sure if I should have just used the short versions instead, even if they might not have been declared via use.

Also, I don't know if "buffer type" is the best way to put it or not.  Alternatively I could call it a "growable type" or "growable buffer type", but I was thinking of PathBuf when I started making the lint.

changelog: Add `rc_buffer` lint

Auto merge of rust-lang#5740 - lzutao:unused-unused, r=flip1995

Remove unused allowed unused attributes

changelog: none

Avoid triggering similar names on code from expansion

Auto merge of rust-lang#5652 - rust-lang:flip1995-patch-1, r=yaahc

Fail bors on missing changelog

Bors stopped failed if the changelog was missing. Instead it waited 2h (?) and then timed out.

changelog: none

Auto merge of rust-lang#5652 - rust-lang:flip1995-patch-1, r=yaahc

Fail bors on missing changelog

Bors stopped failed if the changelog was missing. Instead it waited 2h (?) and then timed out.

changelog: none

Auto merge of rust-lang#5652 - rust-lang:flip1995-patch-1, r=yaahc

Fail bors on missing changelog

Bors stopped failed if the changelog was missing. Instead it waited 2h (?) and then timed out.

changelog: none

Merge pull request rust-lang#5584 from Mark-Simulacrum/beta-next

Add hint for collect type

Auto merge of rust-lang#5314 - ehuss:remove-git2, r=flip1995

Remove git2 dependency.

This removes the `git2` dependency (used in the integration test).  Updating git2 is awkward because both cargo and clippy have to be updated in sync, so this removes that requirement. It didn't look like it was using the git2 library for any particular reason, so this just launches the `git` executable, which should be available more or less everywhere.

This unblocks updating Cargo.

changelog: none