Rollup of 14 pull requests

[Centril]

Successful merges:

• Fix documentation of Rc::make_mut regarding rc::Weak. #61135 (Fix documentation of Rc::make_mut regarding rc::Weak.)
• miri unsizing: fix projecting into a field of an operand #61404 (miri unsizing: fix projecting into a field of an operand)
• Fix an ICE with a const argument in a trait #61409 (Fix an ICE with a const argument in a trait)
• Re-implement async fn drop order lowering  #61413 (Re-implement async fn drop order lowering )
• Add an unusual-conversion example to to_uppercase #61419 (Add an unusual-conversion example to to_uppercase)
• Succinctify splice docs #61420 (Succinctify splice docs)
• Suggest using as_ref on *const T #61444 (Suggest using as_ref on *const T)
• On TerminatorKind::DropAndReplace still handle unused_mut correctly #61446 (On TerminatorKind::DropAndReplace still handle unused_mut correctly)
• azure: retry s3 upload if it fails #61485 (azure: retry s3 upload if it fails)
• ci: Reenable step timings on AppVeyor #61489 (ci: Reenable step timings on AppVeyor)
• Utilize cfg(bootstrap) over cfg(stage0) #61494 (Utilize cfg(bootstrap) over cfg(stage0))
• Do not panic in tidy on unbalanced parentheses in cfg's #61496 (Do not panic in tidy on unbalanced parentheses in cfg's)
• Treat 0 as special value for codegen-units-std #61497 (Treat 0 as special value for codegen-units-std)
• Add regression test for existential type ICE #53457 #61499 (Add regression test for existential type ICE non-defining existential type use in defining scope with empty lifetime name #53457)

Failed merges:

r? @ghost

[Centril]

@bors r+ p=14 rollup=never

[bors]

📌 Commit 70865fc has been approved by Centril

[bors]

⌛ Testing commit 70865fc with merge 3d65e1878e6e459beb8de79990deb5997311447f...

[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:22da64cc:start=1559615694654688155,finish=1559615794894299143,duration=100239610988
$ 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
---
[00:04:01]    Compiling std v0.0.0 (/checkout/src/libstd)
[00:04:03] error[E0093]: unrecognized intrinsic function: `unchecked_add`
[00:04:03]     --> src/libcore/intrinsics.rs:1246:5
[00:04:03]      |
[00:04:03] 1246 |     pub fn unchecked_add<T>(x: T, y: T) -> T;
[00:04:03]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unrecognized intrinsic
[00:04:03] 
[00:04:03] error[E0093]: unrecognized intrinsic function: `unchecked_sub`
[00:04:03]      |
[00:04:03]      |
[00:04:03] 1251 |     pub fn unchecked_sub<T>(x: T, y: T) -> T;
[00:04:03]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unrecognized intrinsic
[00:04:03] 
[00:04:03] error[E0093]: unrecognized intrinsic function: `unchecked_mul`
[00:04:03]      |
[00:04:03]      |
[00:04:03] 1256 |     pub fn unchecked_mul<T>(x: T, y: T) -> T;
[00:04:03]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unrecognized intrinsic
[00:04:03]    Compiling rustc_lsan v0.0.0 (/checkout/src/librustc_lsan)
[00:04:03]    Compiling rustc_msan v0.0.0 (/checkout/src/librustc_msan)
[00:04:04]    Compiling rustc_tsan v0.0.0 (/checkout/src/librustc_tsan)
[00:04:04]    Compiling rustc_asan v0.0.0 (/checkout/src/librustc_asan)
---
travis_time:end:07656ac8:start=1559616055171504766,finish=1559616055176159209,duration=4654443
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:0f54cdec
$ 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:0adac73c
travis_time:start:0adac73c
$ 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

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)

[bors]

💔 Test failed - checks-travis

[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.

[00:05:04]    Compiling std v0.0.0 (/checkout/src/libstd)
[00:05:06] error[E0093]: unrecognized intrinsic function: `unchecked_add`
[00:05:06]     --> src/libcore/intrinsics.rs:1246:5
[00:05:06]      |
[00:05:06] 1246 |     pub fn unchecked_add<T>(x: T, y: T) -> T;
[00:05:06]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unrecognized intrinsic
[00:05:06] 
[00:05:06] error[E0093]: unrecognized intrinsic function: `unchecked_sub`
[00:05:06]      |
[00:05:06]      |
[00:05:06] 1251 |     pub fn unchecked_sub<T>(x: T, y: T) -> T;
[00:05:06]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unrecognized intrinsic
[00:05:06] 
[00:05:06] error[E0093]: unrecognized intrinsic function: `unchecked_mul`
[00:05:06]      |
[00:05:06]      |
[00:05:06] 1256 |     pub fn unchecked_mul<T>(x: T, y: T) -> T;
[00:05:06]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unrecognized intrinsic
[00:05:06]    Compiling rustc_tsan v0.0.0 (/checkout/src/librustc_tsan)
[00:05:06]    Compiling rustc_lsan v0.0.0 (/checkout/src/librustc_lsan)
[00:05:07]    Compiling rustc_msan v0.0.0 (/checkout/src/librustc_msan)
[00:05:07]    Compiling rustc_asan v0.0.0 (/checkout/src/librustc_asan)
---
travis_time:end:0645e16c:start=1559616100525901506,finish=1559616100532084297,duration=6182791
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:25ed23c0
$ 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:11a6eaf8
travis_time:start:11a6eaf8
$ 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:058b8288
$ 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)