Beta backport PR 52564: LHS of assign op is invariant

[pnkfelix]

backport of #52564

[rust-highfive]

r? @petrochenkov

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[rust-highfive]

⚠️ Warning ⚠️

• Pull requests are usually filed against the master branch for this repo, but this one is against beta. Please double check that you specified the right target!

[pnkfelix]

oh i guess #52750 already handled this

[rust-highfive]

The job dist-x86_64-apple-alt 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.

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==> Pouring portable-ruby-2.3.7.leopard_64.bottle.tar.gz
==> Migrating tap caskroom/cask to homebrew/cask...
Changing remote from https://github.com/caskroom/homebrew-cask to https://github.com/Homebrew/homebrew-cask...
Moving /usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask to /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask...
==> New Formulae
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---
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just                                     winetricks
jvgrep                                   wiredtiger
jvm-mon                                  wireguard-tools
kafka                                    wireshark
kaitai-struct-compiler                   wla-dx
kallisto                                 woboq_codebrowser
kanif                                    wolfssl
kapacitor                                wpscan
kedge                                    wrangler
keepassc                                 wslay
kerl                                     wtf
keychain                                 wxmac
khal                                     wxmaxima
kibana                                   x265
kibana@5.6                               x3270
kitchen-sync                             xapian
kitchen-sync                             xapian
klavaro                                  xboard
knot                                     xdot
knot-resolver                            xerces-c
kobalt                                   xmake
kompose                                  xml-security-c
konoha                                   xml-tooling-c
kontena                                  xmount
kops                                     xmrig
kotlin                                   xonsh
krakend                                  xqilla
krb5                                     xrootd
kube-aws                                 xsane
kubectx                                  xsv
kubeless                                 xtensor
kubernetes-cli                           xxhash
kubernetes-helm                          xz
lablgtk                                  yaf
lammps                                   yaml-cpp
landscaper                               yarn
languagetool                             yash
lapack                                   yaws
lasi                                     yaz
lastpass-cli                             yelp-tools
laszip                                   ykman
latex2html                               ykpers
latex2rtf                                yle-dl
launch                                   yosys
launch4j                                 you-get
lbdb                                     youtube-dl
lcdf-typetools                           yq
lcm                                      z3
ldc                                      zabbix
lean                                     zanata-client
lean-cli                                 zbackup
leaps                                    zbar
ledger                                   zebra
legit                                    zenity
lego                                     zeromq
lensfun                                  zig
leptonica                                zim
less                                     zimg
lgogdownloader                           zint
libatomic_ops                            zita-convolver
libav                                    zmap
libbitcoin                               znapzend
libbitcoin-blockchain                    znc
libbitcoin-explorer                      zookeeper
libbitcoin-node                          zopfli
libbitcoin-server                        zorba
libbladerf                               zsh
libbpg                                   zsh-autosuggestions
libcanberra                              zstd
cdiff -> ydiff                           php70 -> php@7.0
crystal-lang -> crystal                  php71 -> php@7.1
crystal-lang -> crystal                  php71 -> php@7.1
geth -> ethereum                         php72 -> php
latexila -> gnome-latex                  saltstack -> salt
php56 -> php@5.6                         wpcli-completion -> wp-cli-completion
==> Deleted Formulae
arm                 go@1.7              mimetic             ruby@1.9
artifactory-cli-go  i3                  monotone            ruby@2.1
aws-cloudsearch     i3status            nazghul             tomcat@8.0
bokken              llvm@3.8            picolisp            ufoai
ecj                 luciddb             python3             voltdb
go@1.6              mal4s               root@5              wry
==> Pouring xz-5.2.4.high_sierra.bottle.tar.gz
🍺  /usr/local/Cellar/xz/5.2.4: 92 files, 1MB
travis_time:end:0363b7fa:start=1532639392082921000,finish=1532639574094220000,duration=182011299000
travis_fold:end:install
---
[01:24:11] travis_time:end:stage2-miri:start=1532644620729848000,finish=1532644625847122000,duration=5117274000

[01:24:11] Build completed successfully in 1:15:31
[01:24:12]     Finished dev [unoptimized] target(s) in 0.77s
[01:24:16] fatal: Not a valid commit name 922c0e0cc04a320e7329105c075967dc62e0cc98
[01:24:16] thread 'main' panicked at 'command did not execute successfully: "git" "merge-base" "922c0e0cc04a320e7329105c075967dc62e0cc98" "45b48b9b6d70065a16cc119fe934ed342c664c78"
[01:24:16] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[01:24:16] failed to run: /Users/travis/build/rust-lang/rust/build/bootstrap/debug/bootstrap doc
[01:24:16] Build completed unsuccessfully in 0:00:04
[01:24:16] Build completed unsuccessfully in 0:00:04
[01:24:16] make: *** [all] Error 1

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:0a69316a
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)
---
travis_fold:start:after_failure.2
travis_time:start:09705220
$ ls -lat $HOME/Library/Logs/DiagnosticReports/
total 0
drwx------+ 15 travis  staff  510 Jan 25  2018 ..
drwx------   2 travis  staff   68 Dec  6  2017 .
travis_fold:end:after_failure.2
travis_fold:start:after_failure.3
travis_time:start:147b6f9a
$ find $HOME/Library/Logs/DiagnosticReports -type f -name '*.crash' -not -name '*.stage2-*.crash' -not -name 'com.apple.CoreSimulator.CoreSimulatorService-*.crash' -exec printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" {} \; -exec head -750 {} \; -exec echo travis_fold":"end:crashlog \; || true
$ find $HOME/Library/Logs/DiagnosticReports -type f -name '*.crash' -not -name '*.stage2-*.crash' -not -name 'com.apple.CoreSimulator.CoreSimulatorService-*.crash' -exec printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" {} \; -exec head -750 {} \; -exec echo travis_fold":"end:crashlog \; || true
travis_time:end:147b6f9a:start=1532644633788284000,finish=1532644633811753000,duration=23469000
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:04c1d360
$ head -30 ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
head: ./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.4
travis_fold:start:after_failure.5
travis_time:start:0e3bfd72
$ dmesg | grep -i kill
$ dmesg | grep -i kill
Unable to obtain kernel buffer: Operation not permitted
usage: sudo dmesg
travis_fold:end:after_failure.5

Done. Your build exited with 1.

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