Rollup of 9 pull requests

[Centril]

Successful merges:

• Clarify docs for unreachable! macro #61084 (Clarify docs for unreachable! macro)
• Added error message for E0284 #61220 (Added error message for E0284)
• Use .await syntax instead of await! #61227 (Use .await syntax instead of await!)
• avoid creating Boxes of uninitalized values in RawVec #61230 (avoid creating Boxes of uninitalized values in RawVec)
• Updated the Iterator docs with information about overriding methods. #61237 (Updated the Iterator docs with information about overriding methods.)
• Check place iterative #61241 (Check place iterative)
• Make dest_needs_borrow iterate instead of recurse #61242 (Make dest_needs_borrow iterate instead of recurse)
• Make eval_place iterate instead of recurse #61247 (Make eval_place iterate instead of recurse)
• Use Place::local #61248 (Use Place::local)

Failed merges:

r? @ghost

[Centril]

@bors r+ rollup=never p=9

[bors]

📌 Commit 149c53f has been approved by Centril

[bors]

⌛ Testing commit 149c53f with merge 05de9f3...

[bors]

💔 Test failed - checks-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.

[01:49:28] test string::test_str_truncate ... ok
[01:49:28] test string::test_str_truncate_invalid_len ... ok
[01:49:28] test string::test_str_truncate_split_codepoint ... ok
[01:49:28] test string::test_split_off_empty ... ok
[01:49:28] died due to signal 11
[01:49:28] error: test failed, to rerun pass '-p alloc --test collectionstests'
[01:49:28] 
[01:49:28] 
[01:49:28] 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 compiler-builtins-c" "--manifest-path" "/checkout/src/libstd/Cargo.toml" "-p" "alloc" "--"
[01:49:28] 
[01:49:28] 
[01:49:28] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test --target arm-linux-androideabi
[01:49:28] Build completed unsuccessfully in 1:38:29
---
travis_time:end:05b4703b:start=1559044026159210400,finish=1559044026170679331,duration=11468931
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:13136565
$ 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:04ffed98
travis_time:start:04ffed98
$ 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:110f519c
$ 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)

[Centril]

@bors retry

[bors]

⌛ Testing commit 149c53f with merge 7da1185...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: Centril
Pushing 7da1185 to master...