Don't generate div inside header (h4/h3/h...) elements

[GuillaumeGomez]

Fixes #60865.

According to the HTML spec, we're not supposed to put div elements inside heading elements (h4/h3/h...). It doesn't change the display as far as I could tell.

r? @QuietMisdreavus

[rust-highfive]

The job x86_64-gnu-llvm-6.0 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.

travis_time:end:0cf62d48:start=1559051331972176186,finish=1559051421095330445,duration=89123154259
$ git checkout -qf FETCH_HEAD
travis_fold:end:git.checkout

Encrypted environment variables have been removed for security reasons.
See https://docs.travis-ci.com/user/pull-requests/#pull-requests-and-security-restrictions
$ export SCCACHE_BUCKET=rust-lang-ci-sccache2
$ export SCCACHE_REGION=us-west-1
$ export GCP_CACHE_BUCKET=rust-lang-ci-cache
$ export AWS_ACCESS_KEY_ID=AKIA46X5W6CZEJZ6XT55
---
travis_time:start:test_codegen
Check compiletest suite=codegen mode=codegen (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[01:23:57] 
[01:23:57] running 143 tests
[01:23:59] i..iii.....iii..iiii.....i......................i...i................i.....i..........ii.i..i..i.ii. 100/143
[01:24:01] test result: ok. 113 passed; 0 failed; 30 ignored; 0 measured; 0 filtered out
[01:24:01] 
[01:24:01]  finished in 4.910
[01:24:01] travis_fold:end:test_codegen
---
travis_time:start:test_assembly
Check compiletest suite=assembly mode=assembly (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[01:24:04] 
[01:24:04] running 9 tests
[01:24:04] iiiiiiiii
[01:24:04] 
[01:24:04]  finished in 0.169
[01:24:04] travis_fold:end:test_assembly

---
travis_time:start:test_debuginfo
Check compiletest suite=debuginfo mode=debuginfo-gdb+lldb (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[01:24:20] 
[01:24:20] running 122 tests
[01:24:47] .iiiii...i.....i..i...i..i.i.i..i.ii..i.i.....i..i....i..........iiii..........i...ii...i.......ii.i 100/122
[01:24:52] .i.i......iii.i.....ii
[01:24:52] 
[01:24:52]  finished in 31.600
[01:24:52] travis_fold:end:test_debuginfo

---
[01:29:04] 
[01:29:04] running 309 tests
[01:30:24] .............................i...................................................................... 100/309
[01:31:32] ..............................................i..................................................... 200/309
[01:32:37] .........................................................................................F.......... 300/309
[01:32:42] failures:
[01:32:42] 
[01:32:42] ---- [rustdoc] rustdoc/trait-attributes.rs stdout ----
[01:32:42] 
[01:32:42] 
[01:32:42] error: htmldocck failed!
[01:32:42] status: exit code: 1
[01:32:42] command: "/usr/bin/python2.7" "/checkout/src/etc/htmldocck.py" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/trait-attributes" "/checkout/src/test/rustdoc/trait-attributes.rs"
[01:32:42] stdout:
[01:32:42] note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
[01:32:42] ------------------------------------------
[01:32:42] 
[01:32:42] 
[01:32:42] ------------------------------------------
[01:32:42] stderr:
[01:32:42] ------------------------------------------
[01:32:42] 6: @has check failed
[01:32:42]  `XPATH PATTERN` did not match
[01:32:42]      // @has foo/trait.Foo.html '//h3[@id="tymethod.foo"]//div[@class="docblock attributes"]' '#[must_use]'
[01:32:42] 15: @has check failed
[01:32:42]  `XPATH PATTERN` did not match
[01:32:42]      // @has foo/struct.Bar.html '//h4[@id="method.bar"]//div[@class="docblock attributes"]' '#[must_use]'
[01:32:42] 19: @has check failed
[01:32:42]  `XPATH PATTERN` did not match
[01:32:42]      // @has foo/struct.Bar.html '//h4[@id="method.bar2"]//div[@class="docblock attributes"]' '#[must_use]'
[01:32:42] Encountered 3 errors
[01:32:42] 
[01:32:42] ------------------------------------------
[01:32:42] 
---
[01:32:42] test result: FAILED. 306 passed; 1 failed; 2 ignored; 0 measured; 0 filtered out
[01:32:42] 
[01:32:42] 
[01:32:42] 
[01:32:42] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--rustdoc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" "--src-base" "/checkout/src/test/rustdoc" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "rustdoc" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-6.0/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "6.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[01:32:42] 
[01:32:42] 
[01:32:42] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[01:32:42] Build completed unsuccessfully in 0:21:09
[01:32:42] Build completed unsuccessfully in 0:21:09
[01:32:42] make: *** [check] Error 1
[01:32:42] Makefile:48: recipe for target 'check' failed
The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:1b36fb8e
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)
Tue May 28 15:23:13 UTC 2019
---
travis_time:end:09145d53:start=1559056994768923504,finish=1559056994774354286,duration=5430782
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:29aac1c0
$ 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:20535df2
travis_time:start:20535df2
$ 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:13c66180
$ dmesg | grep -i kill

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[Manishearth]

r=me with tests updated

r? @Manishearth

[GuillaumeGomez]

@bors: r=Manishearth

[bors]

📌 Commit 3509162 has been approved by Manishearth

[GuillaumeGomez]

@bors: rollup