submodules: update clippy from fc24fce7 to 721f688e

[matthiaskrgr]

Fixes clippy toolstate.

Changes:

rustup https://github.com/rust-lang/rust/pull/57069
Rustfmt.
fix breakage from rust-lang/rust#57088
fix a couple of ftrivial typos (NFC).
update CARGO_CLIPPY_HELP string to suggest tool lints.
rustc_tools_util: add readme
rustc_tool_utils: expand Cargo.toml with a few keywords in preparation for crates.io release
Fix macro detection in `empty_loop`.
Changed `macro_backtrace()` to `in_macro()`.
Fix lint detection on macro expansion.

r? @oli-obk

[rust-highfive]

⚠️ Warning ⚠️

• These commits modify submodules.

[matthiaskrgr]

as of right now, clippy fails to build, I'll update the PR once that has been fixed upstream

[matthiaskrgr]

PR updated, should work again.

[oli-obk]

I think this'll be included in #56924

[Xanewok]

@oli-obk as of now that PR is updating only Cargo, RLS and Miri and since RLS itself fails due to Clippy's broken build, so technically that PR is blocked on this one :(
@ehuss we might want to also bump clippy in the #56924 but that PR was pretty volatile.

However, it was hard to coordinate due to several Miri and RLS test failures - could we possibly r+ and p=1 this instead?

[ehuss]

I can include it, but I would prefer to p=1 this one since that big PR is risky and has been difficult to move through.

[oli-obk]

@bors r+ p=1

[bors]

📌 Commit c7bbf7a15de54a7f242114a4e11f0e0efa765adc has been approved by oli-obk

[oli-obk]

makes sense. We could also p=1 the bigger PR

[oli-obk]

@bors r+ p=1

[bors]

📌 Commit 1654ef8 has been approved by oli-obk

[bors]

⌛ Testing commit 1654ef8 with merge 8a136d9423aae99919c1296cda00ebd4d22b8d9c...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job arm-android of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[01:37:23] test string::test_str_clear ... ok
[01:37:23] test string::test_str_truncate ... ok
[01:37:23] test string::test_str_truncate_invalid_len ... ok
[01:37:23] test string::test_str_truncate_split_codepoint ... ok
[01:37:24] died due to signal 11
[01:37:24] 
[01:37:24] 
[01:37:24] 
[01:37:24] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "test" "--target" "arm-linux-androideabi" "-j" "4" "--release" "--locked" "--color" "always" "--features" "panic-unwind backtrace" "--manifest-path" "/checkout/src/libstd/Cargo.toml" "-p" "alloc" "--"
[01:37:24] 
[01:37:24] 
[01:37:24] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test --target arm-linux-androideabi
[01:37:24] Build completed unsuccessfully in 1:27:16
---
travis_time:end:0d8ca458:start=1546027294309586929,finish=1546027294328097076,duration=18510147
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:07877fc4
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb --batch -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:0baf3ae7
travis_time:start:0baf3ae7
$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:3af4c8da
$ dmesg | grep -i kill

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[oli-obk]

@bors retry random testsuite segfault

[ehuss]

#55861 😢

[bors]

⌛ Testing commit 1654ef8 with merge d9e3edb...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: oli-obk
Pushing d9e3edb to master...

[rust-highfive]

📣 Toolstate changed by #57138!

Tested on commit d9e3edb.
Direct link to PR: #57138

🎉 clippy-driver on windows: build-fail → test-pass (cc @Manishearth @llogiq @mcarton @oli-obk, @rust-lang/infra).
🎉 clippy-driver on linux: build-fail → test-pass (cc @Manishearth @llogiq @mcarton @oli-obk, @rust-lang/infra).
🎉 rls on windows: build-fail → test-pass (cc @nrc @Xanewok, @rust-lang/infra).
🎉 rls on linux: build-fail → test-pass (cc @nrc @Xanewok, @rust-lang/infra).