resolved upstream merge conflicts

.gitattributes

@@ -4,7 +4,8 @@
 *.cpp rust
 *.h rust
 *.rs rust
+*.fixed linguist-language=Rust
 src/etc/installer/gfx/* binary
 *.woff binary
 src/vendor/** -text
-Cargo.lock -merge
+Cargo.lock -merge linguist-generated=false

.gitignore

@@ -74,27 +74,30 @@ __pycache__/
 /obj/
 /rt/
 /rustllvm/
-/src/libstd_unicode/DerivedCoreProperties.txt
-/src/libstd_unicode/DerivedNormalizationProps.txt
-/src/libstd_unicode/PropList.txt
-/src/libstd_unicode/ReadMe.txt
-/src/libstd_unicode/Scripts.txt
-/src/libstd_unicode/SpecialCasing.txt
-/src/libstd_unicode/UnicodeData.txt
+/src/libcore/unicode/DerivedCoreProperties.txt
+/src/libcore/unicode/DerivedNormalizationProps.txt
+/src/libcore/unicode/PropList.txt
+/src/libcore/unicode/ReadMe.txt
+/src/libcore/unicode/Scripts.txt
+/src/libcore/unicode/SpecialCasing.txt
+/src/libcore/unicode/UnicodeData.txt
 /stage[0-9]+/
 /target
 target/
 /test/
 /tmp/
+tags
+tags.*
 TAGS
-TAGS.emacs
-TAGS.vi
+TAGS.*
 \#*
 \#*\#
 config.mk
 config.stamp
 keywords.md
 lexer.ml
+mir_dump
+Session.vim
 src/etc/dl
 tmp.*.rs
 version.md

.gitmodules

@@ -53,3 +53,6 @@
 [submodule "src/tools/lld"]
 	path = src/tools/lld
 	url = https://github.com/rust-lang/lld.git
+[submodule "src/libbacktrace"]
+	path = src/libbacktrace
+	url = https://github.com/rust-lang-nursery/libbacktrace

.mailmap

@@ -51,6 +51,7 @@ Carol Willing <carolcode@willingconsulting.com>
 Chris C Cerami <chrisccerami@users.noreply.github.com> Chris C Cerami <chrisccerami@gmail.com>
 Chris Pressey <cpressey@gmail.com>
 Chris Thorn <chris@thorn.co> Chris Thorn <thorn@thoughtbot.com>
+Chris Vittal <christopher.vittal@gmail.com> Christopher Vittal <christopher.vittal@gmail.com>
 Clark Gaebel <cg.wowus.cg@gmail.com> <cgaebel@mozilla.com>
 Clinton Ryan <clint.ryan3@gmail.com>
 Corey Richardson <corey@octayn.net> Elaine "See More" Nemo <corey@octayn.net>

.travis.yml

@@ -3,6 +3,10 @@ sudo: required
 dist: trusty
 services:
   - docker
+addons:
+  apt:
+    packages:
+      - gdb
 
 git:
   depth: 2
@@ -12,7 +16,7 @@ matrix:
   fast_finish: true
   include:
     # Images used in testing PR and try-build should be run first.
-    - env: IMAGE=x86_64-gnu-llvm-3.9 RUST_BACKTRACE=1
+    - env: IMAGE=x86_64-gnu-llvm-5.0 RUST_BACKTRACE=1
       if: type = pull_request OR branch = auto
 
     - env: IMAGE=dist-x86_64-linux DEPLOY=1
@@ -169,7 +173,7 @@ matrix:
     - env: IMAGE=x86_64-gnu-aux
       if: branch = auto
     - env: IMAGE=x86_64-gnu-tools
-      if: branch = auto
+      if: branch = auto OR (type = pull_request AND commit_message =~ /(?i:^update.*\b(rls|rustfmt|clippy|miri)\b)/)
     - env: IMAGE=x86_64-gnu-debug
       if: branch = auto
     - env: IMAGE=x86_64-gnu-nopt
@@ -197,7 +201,7 @@ env:
     # AWS_SECRET_ACCESS_KEY=...
     - secure: "j96XxTVOSUf4s4r4htIxn/fvIa5DWbMgLqWl7r8z2QfgUwscmkMXAwXuFNc7s7bGTpV/+CgDiMFFM6BAFLGKutytIF6oA02s9b+usQYnM0th7YQ2AIgm9GtMTJCJp4AoyfFmh8F2faUICBZlfVLUJ34udHEe35vOklix+0k4WDo="
     # TOOLSTATE_REPO_ACCESS_TOKEN=...
-    - secure: "cFh8thThqEJLC98XKI5pfqflUzOlxsYPRW20AWRaYOOgYHPTiGWypTXiPbGSKaeAXTZoOA+DpQtEmefc0U6lt9dHc7a/MIaK6isFurjlnKYiLOeTruzyu1z7PWCeZ/jKXsU2RK/88DBtlNwfMdaMIeuKj14IVfpepPPL71ETbuk="
+    - secure: "ESfcXqv4N2VMhqi2iIyw6da9VrsA78I4iR1asouCaq4hzTTrkB4WNRrfURy6xg72gQ4nMhtRJbB0/2jmc9Cu1+g2CzXtyiL223aJ5CKrXdcvbitopQSDfp07dMWm+UED+hNFEanpErKAeU/6FM3A+J+60PMk8MCF1h9tqNRISJw="
 
 before_install:
   # We'll use the AWS cli to download/upload cached docker layers, so install
@@ -230,7 +234,11 @@ install:
           travis_retry curl -fo /usr/local/bin/sccache https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/2018-04-02-sccache-x86_64-apple-darwin &&
             chmod +x /usr/local/bin/sccache &&
           travis_retry curl -fo /usr/local/bin/stamp https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror/2017-03-17-stamp-x86_64-apple-darwin &&
-            chmod +x /usr/local/bin/stamp
+            chmod +x /usr/local/bin/stamp &&
+          travis_retry curl -f http://releases.llvm.org/6.0.0/clang+llvm-6.0.0-x86_64-apple-darwin.tar.xz | tar xJf - &&
+            export CC=`pwd`/clang+llvm-6.0.0-x86_64-apple-darwin/bin/clang &&
+            export CXX=`pwd`/clang+llvm-6.0.0-x86_64-apple-darwin/bin/clang++ &&
+            export AR=ar
           ;;
     esac
 
@@ -245,6 +253,8 @@ before_script:
           export RUN_SCRIPT="$RUN_SCRIPT && src/ci/run.sh";
       else
           export RUN_SCRIPT="$RUN_SCRIPT && src/ci/docker/run.sh $IMAGE";
+          # Enable core dump on Linux.
+          sudo sh -c 'echo "/checkout/obj/cores/core.%p.%E" > /proc/sys/kernel/core_pattern';
       fi
 
 # Log time information from this machine and an external machine for insight into possible
@@ -270,6 +280,8 @@ after_failure:
 
   # Random attempt at debugging currently. Just poking around in here to see if
   # anything shows up.
+
+  # Dump backtrace for macOS
   - ls -lat $HOME/Library/Logs/DiagnosticReports/
   - find $HOME/Library/Logs/DiagnosticReports
       -type f
@@ -280,6 +292,25 @@ after_failure:
       -exec head -750 {} \;
       -exec echo travis_fold":"end:crashlog \; || true
 
+  # Dump backtrace for Linux
+  - 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 -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
+
+  # see #50887
+  - cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
+
   # attempt to debug anything killed by the oom killer on linux, just to see if
   # it happened
   - dmesg | grep -i kill
@@ -297,7 +328,6 @@ before_deploy:
           rm -rf obj/build/dist/doc &&
           cp -r obj/build/dist/* deploy/$TRAVIS_COMMIT;
       fi
-  - travis_retry gem update --system
   - ls -la deploy/$TRAVIS_COMMIT
 
 deploy:

CONTRIBUTING.md

@@ -48,7 +48,7 @@ always work, and sometimes it's hard to know what to search for, so consider thi
 extra credit. We won't mind if you accidentally file a duplicate report.
 
 Similarly, to help others who encountered the bug find your issue,
-consider filing an issue with with a descriptive title, which contains information that might be unique to it.
+consider filing an issue with a descriptive title, which contains information that might be unique to it.
 This can be the language or compiler feature used, the conditions that trigger the bug,
 or part of the error message if there is any.
 An example could be: **"impossible case reached" on lifetime inference for impl Trait in return position**.
@@ -142,7 +142,7 @@ file. If you still have a `config.mk` file in your directory - from
 ### Building
 [building]: #building
 
-A default configuration shall use around 3.5 GB of disk space, whereas building a debug configuration may require more than 30 GB.
+A default configuration requires around 3.5 GB of disk space, whereas building a debug configuration may require more than 30 GB.
 
 Dependencies
 - [build dependencies](README.md#building-from-source)

README.md

@@ -38,6 +38,7 @@ Read ["Installation"] from [The Book].
 3. Build and install:
 
     ```sh
+    $ git submodule update --init --recursive --progress
     $ ./x.py build && sudo ./x.py install
     ```
 
@@ -119,7 +120,7 @@ shell with:
 > python x.py build
 ```
 
-Currently building Rust only works with some known versions of Visual Studio. If
+Currently, building Rust only works with some known versions of Visual Studio. If
 you have a more recent version installed the build system doesn't understand
 then you may need to force rustbuild to use an older version. This can be done
 by manually calling the appropriate vcvars file before running the bootstrap.
@@ -133,7 +134,7 @@ python x.py build
 [specifying-an-abi]: #specifying-an-abi
 
 Each specific ABI can also be used from either environment (for example, using
-the GNU ABI in powershell) by using an explicit build triple. The available
+the GNU ABI in PowerShell) by using an explicit build triple. The available
 Windows build triples are:
 - GNU ABI (using GCC)
     - `i686-pc-windows-gnu`
@@ -179,7 +180,7 @@ the ABI used. I.e., if the ABI was `x86_64-pc-windows-msvc`, the directory will
 [notes]: #notes
 
 Since the Rust compiler is written in Rust, it must be built by a
-precompiled "snapshot" version of itself (made in an earlier state of
+precompiled "snapshot" version of itself (made in an earlier stage of
 development). As such, source builds require a connection to the Internet, to
 fetch snapshots, and an OS that can execute the available snapshot binaries.
 
@@ -224,13 +225,16 @@ variety of channels on Mozilla's IRC network, irc.mozilla.org. The
 most popular channel is [#rust], a venue for general discussion about
 Rust. And a good place to ask for help would be [#rust-beginners].
 
-Also, the [rustc guide] might be a good place to start if you want to
-find out how various parts of the compiler work.
+The [rustc guide] might be a good place to start if you want to find out how
+various parts of the compiler work.
+
+Also, you may find the [rustdocs for the compiler itself][rustdocs] useful.
 
 [IRC]: https://en.wikipedia.org/wiki/Internet_Relay_Chat
 [#rust]: irc://irc.mozilla.org/rust
 [#rust-beginners]: irc://irc.mozilla.org/rust-beginners
 [rustc guide]: https://rust-lang-nursery.github.io/rustc-guide/about-this-guide.html
+[rustdocs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc/
 
 ## License
 [license]: #license