Rollup of 5 pull requests

[Centril]

Successful merges:

• Update new_debug_unreachable #61767 (Update new_debug_unreachable)
• Adjust warning of -C extra-filename with -o. #62128 (Adjust warning of -C extra-filename with -o.)
• rustdoc: remove unused derives and variants #62224 (rustdoc: remove unused derives and variants)
• Extend the #[must_use] lint to arrays #62235 (Extend the #[must_use] lint to arrays)
• Fix a typo #62239 (Fix a typo)

Failed merges:

r? @ghost

[Centril]

@bors r+ p=5 rollup=never

[bors]

📌 Commit f58e80f has been approved by Centril

[bors]

⌛ Testing commit f58e80f with merge 6338ca593d36f4eb575772d9e7257e2a2f1c9b23...

[bors]

💔 Test failed - checks-travis

[rust-highfive]

The job x86_64-gnu-tools 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.

[01:49:04] test [ui] run-pass/issue-27901.rs ... ok
[01:49:04] thread '[ui] run-pass/issue-30530.rs' panicked at 'explicit panic', /cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.3.22/src/runtest.rs:2632:9
[01:49:04] note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
[01:49:04] normalized stderr:
[01:49:04] error: unused boxed `std::ops::Fn` trait object that must be used
[01:49:04]    |
[01:49:04]    |
[01:49:04] 24 |     take(Handler::Default, Box::new(main));
[01:49:04]    |
[01:49:04]    = note: `-D unused-must-use` implied by `-D unused`
[01:49:04]    = note: `-D unused-must-use` implied by `-D unused`
[01:49:04]    = note: closures are lazy and do nothing unless called
[01:49:04] error: aborting due to previous error
[01:49:04] 
[01:49:04] 
[01:49:04] 
[01:49:04] 
[01:49:04] expected stderr:
[01:49:04] 
[01:49:04] 
[01:49:04] diff of stderr:
[01:49:04] 
[01:49:04] +error: unused boxed `std::ops::Fn` trait object that must be used
[01:49:04] +   |
[01:49:04] +   |
[01:49:04] +24 |     take(Handler::Default, Box::new(main));
[01:49:04] +   |
[01:49:04] +   = note: `-D unused-must-use` implied by `-D unused`
[01:49:04] +   = note: `-D unused-must-use` implied by `-D unused`
[01:49:04] +   = note: closures are lazy and do nothing unless called
[01:49:04] +error: aborting due to previous error
[01:49:04] +
[01:49:04] +
[01:49:04] 
[01:49:04] 
[01:49:04] The actual stderr differed from the expected stderr.
[01:49:04] Actual stderr saved to /tmp/compiletestK1j1uS/issue-30530.stderr
[01:49:04] To update references, run this command from build directory:
[01:49:04] tests/run-pass/update-references.sh '/tmp/compiletestK1j1uS' 'issue-30530.rs'
[01:49:04] error: 1 errors occurred comparing output.
[01:49:04] status: exit code: 1
[01:49:04] status: exit code: 1
[01:49:04] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/miri" "tests/run-pass/issue-30530.rs" "-L" "/tmp/compiletestK1j1uS" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-C" "prefer-dynamic" "-o" "/tmp/compiletestK1j1uS/issue-30530.stage-id" "-Dwarnings" "-Dunused" "--edition" "2018" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "-L" "/tmp/compiletestK1j1uS/issue-30530.stage-id.aux" "-A" "unused"
[01:49:04] ------------------------------------------
[01:49:04] 
[01:49:04] ------------------------------------------
[01:49:04] stderr:
[01:49:04] stderr:
[01:49:04] ------------------------------------------
[01:49:04] {"message":"unused boxed `std::ops::Fn` trait object that must be used","code":{"code":"unused_must_use","explanation":null},"level":"error","spans":[{"file_name":"tests/run-pass/issue-30530.rs","byte_start":864,"byte_end":903,"line_start":24,"line_end":24,"column_start":5,"column_end":44,"is_primary":true,"text":[{"text":"    take(Handler::Default, Box::new(main));","highlight_start":5,"highlight_end":44}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`-D unused-must-use` implied by `-D unused`","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"closures are lazy and do nothing unless called","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error: unused boxed `std::ops::Fn` trait object that must be used\n  --> tests/run-pass/issue-30530.rs:24:5\n   |\n24 |     take(Handler::Default, Box::new(main));\n   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n   |\n   = note: `-D unused-must-use` implied by `-D unused`\n   = note: closures are lazy and do nothing unless called\n\n"}
[01:49:04] 
[01:49:04] ------------------------------------------
[01:49:04] 
[01:49:04] test [ui] run-pass/issue-30530.rs ... FAILED
---
travis_time:end:0214cc40:start=1561859074872804316,finish=1561859074891495552,duration=18691236
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:008e146c
$ 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

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