Only disable rustfmt style checl

.travis.yml

@@ -22,13 +22,13 @@ matrix:
         - shellcheck --version
         - shellcheck ci/*.sh
       stage: tools-and-build-and-tier1
-    # Disabled due to rust-lang/rustfmt#3341
-    #- name: "Style"
-    #  install: rustup component add rustfmt-preview
-    #  script:
-    #    - rustc ci/style.rs && ./style src
-    #    - cargo fmt --all -- --check
-    #  stage: tools-and-build-and-tier1
+    - name: "Style"
+      install: rustup component add rustfmt-preview
+      script:
+        - rustc ci/style.rs && ./style src
+        # Disabled due to rust-lang/rustfmt#3341
+        # - cargo fmt --all -- --check
+      stage: tools-and-build-and-tier1
 
     # BUILD stable, beta, nightly
     - name: "Build Stable Rust"