rustfmt in its own build only

Author: gnzlbg

.appveyor.yml

@@ -15,14 +15,12 @@ install:
   - if NOT "%TARGET%" == "x86_64-pc-windows-msvc" rustup target add %TARGET%
   - rustc -vV
   - cargo -vV
-  - cargo install rustfmt-nightly
 
 build: false
 
 test_script:
   - cargo test --target %TARGET%
   - cargo test --target %TARGET% --release
-  - cargo fmt -- --write-mode=diff
 
 branches:
   only:

.travis.yml

@@ -14,14 +14,21 @@ matrix:
       script: ci/run.sh
     - install: true
       script: ci/dox.sh
+    - env: RUSTFMT=On NO_ADD=1
+  allow_failures:
+    - env: RUSTFMT=On NO_ADD=1
 
 install:
-  - if [ "$NO_ADD" = "" ]; then rustup target add $TARGET; fi
+  - if [ "$NO_ADD" == "" ]; then rustup target add $TARGET; fi
 
 script:
   - cargo generate-lockfile
-  - cargo install rustfmt-nightly
   - ci/run-docker.sh $TARGET
+  - |
+    if [[ ${RUSTFMT} == "On" ]]; then
+      cargo install rustfmt-nightly
+      cargo fmt -- --write-mode=diff
+    fi
 
 notifications:
   email:

ci/run.sh

@@ -4,4 +4,3 @@ set -ex
 
 cargo test --target $TARGET
 cargo test --release --target $TARGET
-cargo fmt -- --write-mode=diff