diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 0000000..46c283b
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,118 @@
+version: 2.1
+
+executors:
+  default:
+    description: Executor environment for building Rust crates.
+    docker:
+      - image: circleci/rust:1
+
+commands:
+  update_toolchain:
+    description: Update the Rust toolchain to use for building.
+    parameters:
+      toolchain:
+        description: Rust toolchain to use. Overrides the default toolchain (stable) or any toolchain specified in the project via `rust-toolchain`.
+        type: string
+        default: ""
+    steps:
+      - run:
+          name: Update toolchain
+          command: |
+            test -z "<<parameters.toolchain>>" || echo "<<parameters.toolchain>>" >rust-toolchain
+            rustup show active-toolchain
+      - run:
+          name: Version information
+          command: |
+            rustup --version
+            rustc --version
+            cargo --version
+
+  build:
+    description: Build all targets of a Rust crate.
+    steps:
+      - run:
+          name: Calculate dependencies
+          command: |
+            rustc --version >rust-version
+            test -e Cargo.lock || cargo generate-lockfile
+      - restore_cache:
+          keys:
+            - v6-cargo-cache-{{arch}}-{{checksum "rust-version"}}-{{checksum "Cargo.lock"}}
+      - run:
+          name: Build all targets
+          command: cargo build --tests
+      - save_cache:
+          paths:
+            - /usr/local/cargo/registry
+            - target
+          key: v6-cargo-cache-{{arch}}-{{checksum "rust-version"}}-{{checksum "Cargo.lock"}}
+
+  check:
+    description: Check all targets of a Rust crate.
+    steps:
+      - run:
+          name: Calculate dependencies
+          command: test -e Cargo.lock || cargo generate-lockfile
+      - run:
+          name: Check all targets
+          command: |
+            if rustup component add clippy; then
+              cargo clippy --all --all-targets -- -Dwarnings
+            else
+              echo Skipping clippy
+            fi
+
+  test:
+    description: Run all tests of a Rust crate. Make sure to build first.
+    parameters:
+      release:
+        description: By default, the crate is build in debug mode without optimizations. Set this to true to compile in release mode.
+        type: boolean
+        default: false
+    steps:
+      - run:
+          name: Run all tests
+          command: cargo test
+
+jobs:
+  check:
+    description: Check a Rust crate.
+    parameters:
+      toolchain:
+        description: Rust toolchain to use. Overrides the default toolchain (stable) or any toolchain specified in the project via `rust-toolchain`.
+        type: string
+        default: ""
+    executor: default
+    steps:
+      - checkout
+      - update_toolchain:
+          toolchain: <<parameters.toolchain>>
+      - check
+
+  test:
+    description: Builds a Rust crate and runs all tests.
+    parameters:
+      toolchain:
+        description: Rust toolchain to use. Overrides the default toolchain (stable) or any toolchain specified in the project via `rust-toolchain`.
+        type: string
+        default: ""
+    executor: default
+    steps:
+      - checkout
+      - update_toolchain:
+          toolchain: <<parameters.toolchain>>
+      - build
+      - test
+
+workflows:
+  Project:
+    jobs:
+#      - test:
+#          name: cargo test (stable)
+#          toolchain: stable
+#      - test:
+#          name: cargo test (beta)
+#          toolchain: beta
+      - test:
+          name: cargo test (nightly)
+          toolchain: nightly
diff --git a/ui/cases/update-references.sh b/ui/cases/update-references.sh
index 66d1e39..51b00fc 100755
--- a/ui/cases/update-references.sh
+++ b/ui/cases/update-references.sh
@@ -1,48 +1,48 @@
-#!/bin/bash
-#
-# Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-# file at the top-level directory of this distribution and at
-# http://rust-lang.org/COPYRIGHT.
-#
-# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-# option. This file may not be copied, modified, or distributed
-# except according to those terms.
-
-# A script to update the references for particular tests. The idea is
-# that you do a run, which will generate files in the build directory
-# containing the (normalized) actual output of the compiler. This
-# script will then copy that output and replace the "expected output"
-# files. You can then commit the changes.
-#
-# If you find yourself manually editing a foo.stderr file, you're
-# doing it wrong.
-
-if [[ "$1" == "--help" || "$1" == "-h" || "$1" == "" || "$2" == "" ]]; then
-    echo "usage: $0 <build-directory> <relative-path-to-rs-files>"
-    echo ""
-    echo "For example:"
-    echo "   $0 ../../../build/x86_64-apple-darwin/test/ui *.rs */*.rs"
-fi
-
-MYDIR=$(dirname $0)
-
-BUILD_DIR="$1"
-shift
-
-while [[ "$1" != "" ]]; do
-    STDERR_NAME="${1/%.rs/.stderr}"
-    STDOUT_NAME="${1/%.rs/.stdout}"
-    shift
-    if [ -f $BUILD_DIR/$STDOUT_NAME ] && \
-           ! (diff $BUILD_DIR/$STDOUT_NAME $MYDIR/$STDOUT_NAME >& /dev/null); then
-        echo updating $MYDIR/$STDOUT_NAME
-        cp $BUILD_DIR/$STDOUT_NAME $MYDIR/$STDOUT_NAME
-    fi
-    if [ -f $BUILD_DIR/$STDERR_NAME ] && \
-           ! (diff $BUILD_DIR/$STDERR_NAME $MYDIR/$STDERR_NAME >& /dev/null); then
-        echo updating $MYDIR/$STDERR_NAME
-        cp $BUILD_DIR/$STDERR_NAME $MYDIR/$STDERR_NAME
-    fi
-done
+#!/bin/bash
+#
+# Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+# A script to update the references for particular tests. The idea is
+# that you do a run, which will generate files in the build directory
+# containing the (normalized) actual output of the compiler. This
+# script will then copy that output and replace the "expected output"
+# files. You can then commit the changes.
+#
+# If you find yourself manually editing a foo.stderr file, you're
+# doing it wrong.
+
+if [[ "$1" == "--help" || "$1" == "-h" || "$1" == "" || "$2" == "" ]]; then
+    echo "usage: $0 <build-directory> <relative-path-to-rs-files>"
+    echo ""
+    echo "For example:"
+    echo "   $0 ../../../build/x86_64-apple-darwin/test/ui *.rs */*.rs"
+fi
+
+MYDIR=$(dirname $0)
+
+BUILD_DIR="$1"
+shift
+
+while [[ "$1" != "" ]]; do
+    STDERR_NAME="${1/%.rs/.stderr}"
+    STDOUT_NAME="${1/%.rs/.stdout}"
+    shift
+    if [ -f $BUILD_DIR/$STDOUT_NAME ] && \
+           ! (diff $BUILD_DIR/$STDOUT_NAME $MYDIR/$STDOUT_NAME >& /dev/null); then
+        echo updating $MYDIR/$STDOUT_NAME
+        cp $BUILD_DIR/$STDOUT_NAME $MYDIR/$STDOUT_NAME
+    fi
+    if [ -f $BUILD_DIR/$STDERR_NAME ] && \
+           ! (diff $BUILD_DIR/$STDERR_NAME $MYDIR/$STDERR_NAME >& /dev/null); then
+        echo updating $MYDIR/$STDERR_NAME
+        cp $BUILD_DIR/$STDERR_NAME $MYDIR/$STDERR_NAME
+    fi
+done