Merged master

Author: LukeMathWalker

.travis.yml

@@ -18,10 +18,16 @@ before_cache: |
   if [[ "$TRAVIS_RUST_VERSION" == nightly ]]; then
     RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install cargo-tarpaulin
   fi
-script:
-- cargo clean
-- cargo build
-- cargo test
+before_script:
+- rustup component add rustfmt
+# As a result of https://github.com/travis-ci/travis-ci/issues/1066, we run
+# everything in one large command instead of multiple commands.
+# In this way, the build stops immediately if one of the commands fails.
+script: |
+  cargo clean &&
+  cargo fmt --all -- --check &&
+  cargo build &&
+  cargo test
 after_success: |
   if [[ "$TRAVIS_RUST_VERSION" == nightly ]]; then
     cargo tarpaulin --out Xml