Rollup of 12 pull requests

[kennytm]

Successful merges:

• syntax: Use iterator and pattern APIs instead of char_at  #55466 (syntax: Use iterator and pattern APIs instead of char_at )
• Improve no result found sentence in doc search #55563 (Improve no result found sentence in doc search)
• Add Weak.ptr_eq #55987 (Add Weak.ptr_eq)
• [rustdoc] Specific crate search #56332 ([rustdoc] Specific crate search)
• Refer to the second borrow as the "second borrow" in E0501.rs #56372 (Refer to the second borrow as the "second borrow" in E0501.rs)
• More MIR borrow check cleanup #56388 (More MIR borrow check cleanup)
• Mention raw-ident syntax #56424 (Mention raw-ident syntax)
• rustbuild: Fix issues with compiler docs #56441 (rustbuild: Fix issues with compiler docs)
• Move compile-fail-fulldeps tests to UI #56444 (Move compile-fail-fulldeps tests to UI)
• Handle existential types in dead code analysis #56456 (Handle existential types in dead code analysis)
• data_structures: remove tuple_slice #56466 (data_structures: remove tuple_slice)
• cleanup: remove static lifetimes from consts in libstd #56497 (cleanup: remove static lifetimes from consts in libstd)

Failed merges:

r? @ghost

[kennytm]

@bors r+ p=12

[bors]

📌 Commit 81d043b has been approved by kennytm

[bors]

⌛ Testing commit 81d043b with merge 2f7617f33ef39b1370b093c19ef1e9f26f5494db...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job dist-i586-gnu-i586-i686-musl 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.

[00:45:42] failures:
[00:45:42] 
[00:45:42] ---- [ui] ui/proc-macro/edition-imports-2018.rs stdout ----
[00:45:42] 
[00:45:42] error: test compilation failed although it shouldn't!
[00:45:42] status: exit code: 1
[00:45:42] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/proc-macro/edition-imports-2018.rs" "--target=i586-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/proc-macro/edition-imports-2018/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/i586-unknown-linux-gnu/native/rust-test-helpers" "-Clinker=cc" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/proc-macro/edition-imports-2018/auxiliary" "-A" "unused"
[00:45:42] ------------------------------------------
[00:45:42] 
[00:45:42] ------------------------------------------
[00:45:42] stderr:
[00:45:42] stderr:
[00:45:42] ------------------------------------------
[00:45:42] {"message":"can't find crate for `edition_imports_2015`","code":{"code":"E0463","explanation":"\nA plugin/crate was declared but cannot be found. Erroneous code example:\n\n```compile_fail,E0463\n#![feature(plugin)]\n#![plugin(cookie_monster)] // error: can't find crate for `cookie_monster`\nextern crate cake_is_a_lie; // error: can't find crate for `cake_is_a_lie`\n```\n\nYou need to link your code to the relevant crate in order to be able to use it\n(through Cargo or the `-L` option of rustc example). Plugins are crates as\nwell, and you link to them the same way.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/proc-macro/edition-imports-2018.rs","byte_start":83,"byte_end":117,"line_start":6,"line_end":6,"column_start":1,"column_end":35,"is_primary":true,"text":[{"text":"extern crate edition_imports_2015;","highlight_start":1,"highlight_end":35}],"label":"can't find crate","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":"error[E0463]: can't find crate for `edition_imports_2015`\n  --> /checkout/src/test/ui/proc-macro/edition-imports-2018.rs:6:1\n   |\nLL | extern crate edition_imports_2015;\n   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate\n\n"}
[00:45:42] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:45:42] {"message":"For more information about this error, try `rustc --explain E0463`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0463`.\n"}
[00:45:42] ------------------------------------------
[00:45:42] 
[00:45:42] thread '[ui] ui/proc-macro/edition-imports-2018.rs' panicked at 'explicit panic', src/tools/compiletest/src/runtest.rs:3282:9
[00:45:42] note: Run with `RUST_BACKTRACE=1` for a backtrace.
---
[00:45:42] 
[00:45:42] thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:503:22
[00:45:42] 
[00:45:42] 
[00:45:42] 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/i586-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/ui" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--stage-id" "stage2-i586-unknown-linux-gnu" "--mode" "ui" "--target" "i586-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/checkout/obj/build/x86_64-unknown-linux-gnu/llvm/build/bin/FileCheck" "--linker" "cc" "--host-rustcflags" "-Crpath -O -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Zunstable-options  -Lnative=/checkout/obj/build/i586-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--llvm-version" "8.0.0svn\n" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[00:45:42] 
[00:45:42] 
[00:45:42] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test --target i586-unknown-linux-gnu,i686-unknown-linux-musl
[00:45:42] Build completed unsuccessfully in 0:43:34
---
travis_time:end:00dc611c:start=1543940667519128148,finish=1543940667525837707,duration=6709559
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:10dcb4fe
$ 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:0a065210
travis_time:start:0a065210
$ 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:076be390
$ dmesg | grep -i kill

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