Travis: Fail only if there are failed {builds, tests, benchs}

.travis.yml

@@ -36,20 +36,24 @@ script:
         travis_cargo_run_in() {
             [[ -d "$1" ]] &&
             cd "$1" &&
+            {
               travis-cargo build &&
               travis-cargo test &&
               travis-cargo bench &&
               travis-cargo --only stable doc &&
               cd -
+            } || exit 1
         }
 
         [[ $(changes_in "doc") ]] && echo "Changes in ./doc are not build by CI"
 
         for d in $(find -name "Cargo.toml" | grep -vE "^.$"); do
             dir=$(dirname $d)
+            {
               changes_in $dir &&                  \
                   echo -e "\nRunning in $d\n" &&  \
                   travis_cargo_run_in $dir
+            } || true
         done
 
 addons: