Rollup of 16 pull requests

[Centril]

Successful merges:

• Update new_debug_unreachable #61767 (Update new_debug_unreachable)
• Remove FnBox #62043 (Remove FnBox)
• Add suggestion for missing .await keyword #62067 (Add suggestion for missing .await keyword)
• Updated RELEASES.md for 1.36.0 #62076 (Updated RELEASES.md for 1.36.0)
• call out explicitly that general read needs to be called with an initialized buffer #62102 (call out explicitly that general read needs to be called with an initialized buffer)
• Add debug assertions to write_bytes and copy* #62103 (Add debug assertions to write_bytes and copy*)
• Add more tests for async/await #62106 (Add more tests for async/await)
• refactor lexer to use idiomatic borrowing #62124 (refactor lexer to use idiomatic borrowing)
• libsyntax: Fix some Clippy warnings #62131 (libsyntax: Fix some Clippy warnings)
• Implement mem::{zeroed,uninitialized} in terms of MaybeUninit. #62150 (Implement mem::{zeroed,uninitialized} in terms of MaybeUninit.)
• Don't ICE on item in .await expression #62152 (Don't ICE on item in .await expression)
• Remove old fixme #62154 (Remove old fixme)
• Add regression test for MIR drop generation in async loops #62155 (Add regression test for MIR drop generation in async loops)
• Update books #62156 (Update books)
• Remove outdated question_mark_macro_sep lint #62160 (Remove outdated question_mark_macro_sep lint)
• save-analysis: use buffered writes #62164 (save-analysis: use buffered writes)

Failed merges:

r? @ghost

[Centril]

@bors r+ p=16 rollup=never

[bors]

📌 Commit a76ff49 has been approved by Centril

[bors]

⌛ Testing commit a76ff49 with merge 42653b44fc7017848645b47c31fdf808be02b56e...

[bors]

💔 Test failed - checks-travis

[rust-highfive]

The job x86_64-gnu-debug 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.

[00:06:56]     Checking rustc_plugin v0.0.0 (/checkout/src/librustc_plugin)
[00:06:56] error[E0599]: no method named `get_parent_node_by_hir_id` found for type `&rustc::hir::map::Map<'_>` in the current scope
[00:06:56]     --> src/librustc_typeck/check/mod.rs:3964:40
[00:06:56]      |
[00:06:56] 3964 |         let item_id = self.tcx().hir().get_parent_node_by_hir_id(self.body_id);
[00:06:56] 
[00:06:56]     Checking rustc_codegen_ssa v0.0.0 (/checkout/src/librustc_codegen_ssa)
[00:07:00] error: aborting due to previous error
[00:07:00] 
---
travis_time:end:15014657:start=1561639104220077617,finish=1561639104228336625,duration=8259008
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:04e66800
$ 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:250fbe97
travis_time:start:250fbe97
$ 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:035b50cf
$ dmesg | grep -i kill

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