Fix rustup fallout

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

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

Move debug_assertions_with_mut_call to nursery