use vendored rustfmt-nightly (src/tools/rustfmt)

[semarie]

Fixes: #52029

[semarie]

The PR is against beta directly: nightly head has been corrected by 68620b1.

I edited Cargo.toml to change [patch.crates-io] to [patch."https://github.com/rust-lang-nursery/rustfmt"]
And run: cargo update -p rustfmt-nightly

[semarie]

cc @alexcrichton @Mark-Simulacrum @bugabinga

[semarie]

I updated Cargo.toml comment to match the change on nightly.

[Mark-Simulacrum]

@bors r+

[bors]

📌 Commit 69ee44d has been approved by Mark-Simulacrum

[bors]

⌛ Testing commit 69ee44d with merge a7e85eb...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: Mark-Simulacrum
Pushing a7e85eb to beta...

[bugabinga]

@semarie

And run: cargo update -p rustfmt-nightly

what version of cargo was used at this point?
when I tried this myself locally, I got an error saying that the -p flag is not supported on the version I was using (which was stable 1.27.0).

[semarie]

it was stable too (1.27.0).

[bugabinga]

it was stable too (1.27.0).

Alright, I must've made some error elsewhere then. Thanks for taking care of this.