tools: Update rustfmt and re-enable testing

[DSpeckhals]

This allows rustfmt and the RLS to test and compile again.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @aturon (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[kennytm]

@bors r+ p=1

Thanks!

[bors]

📌 Commit 1156455 has been approved by kennytm

[bors]

⌛ Testing commit 1156455 with merge d2cdefbbdd19f2df5350987c3ad55f13a4b29fad...

[bors]

💔 Test failed - status-appveyor

[kennytm]

Legit error. rustfmt needs to be updated again.

error[E0004]: non-exhaustive patterns: `Ty` not covered
    --> src\tools\rustfmt\src\items.rs:2714:30
     |
2714 |         let item_str = match self.node {
     |                              ^^^^^^^^^ pattern `Ty` not covered
error: aborting due to previous error
error: Could not compile `rustfmt-nightly`.

[DSpeckhals]

I will see if I can get rustfmt and then the submodule fixed within the next several hours.

[kennytm]

@bors r+

[bors]

📌 Commit e3bf19d has been approved by kennytm

[DSpeckhals]

This should be ready again. @nrc just merged rust-lang/rustfmt@9656627, which covers the non-exhaustive pattern.

[nrc]

@bors r+

[bors]

💡 This pull request was already approved, no need to approve it again.

• There's another pull request that is currently being tested, blocking this pull request: Fix references to zero_memory and copy_memory in ptr docs #45616

[bors]

📌 Commit e3bf19d has been approved by nrc

[bors]

⌛ Testing commit e3bf19d with merge 90ef337...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: nrc
Pushing 90ef337 to master...