diff --git a/.travis.yml b/.travis.yml
index 9769467..c398f90 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,7 +51,7 @@ matrix:
     - rustup component add rustfmt-preview
     - cargo fmt --version
     - cargo fmt --all -- --check
-#    - rustup component add clippy-preview
+    - rustup component add clippy-preview
 #    - cargo clippy --version
 #    - cargo clippy
 
diff --git a/src/command/test.rs b/src/command/test.rs
index 952edd2..948ea02 100644
--- a/src/command/test.rs
+++ b/src/command/test.rs
@@ -382,6 +382,6 @@ impl Test {
         if !self.headless {
             envs.push(("NO_HEADLESS", "1"));
         }
-        return envs;
+        envs
     }
 }
diff --git a/src/main.rs b/src/main.rs
index ec6a470..d40a18c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -64,8 +64,7 @@ fn run() -> Result<(), failure::Error> {
         // If we're actually running as the installer then execute our
         // self-installation, otherwise just continue as usual.
         if me
-            .file_stem()
-            .and_then(|s| s.to_str())
+            .file_stem().and_then(|s| s.to_str())
             .expect("executable should have a filename")
             .starts_with("wasm-pack-init")
         {
@@ -94,18 +93,15 @@ fn setup_panic_hooks() {
 
     let default_hook = panic::take_hook();
 
-    match env::var("RUST_BACKTRACE") {
-        Err(_) => {
-            panic::set_hook(Box::new(move |info: &panic::PanicInfo| {
-                // First call the default hook that prints to standard error.
-                default_hook(info);
-
-                // Then call human_panic.
-                let file_path = human_panic::handle_dump(&meta, info);
-                human_panic::print_msg(file_path, &meta)
-                    .expect("human-panic: printing error message to console failed");
-            }));
-        }
-        Ok(_) => {}
+    if let Err(_) = env::var("RUST_BACKTRACE") {
+        panic::set_hook(Box::new(move |info: &panic::PanicInfo| {
+            // First call the default hook that prints to standard error.
+            default_hook(info);
+
+            // Then call human_panic.
+            let file_path = human_panic::handle_dump(&meta, info);
+            human_panic::print_msg(file_path, &meta)
+                .expect("human-panic: printing error message to console failed");
+        }));
     }
 }
diff --git a/src/manifest/mod.rs b/src/manifest/mod.rs
index 465db20..d23d867 100644
--- a/src/manifest/mod.rs
+++ b/src/manifest/mod.rs
@@ -173,7 +173,7 @@ impl Crate {
 
     fn override_stamp_file(
         current_time: DateTime<offset::Local>,
-        version: &String,
+        version: &str,
     ) -> Result<(), failure::Error> {
         let path = env::current_exe()?;
 
@@ -210,15 +210,13 @@ impl Crate {
     }
 
     /// Read the stamp file and return value assigned to a certain key.
-    fn return_stamp_file_value(file: &String, word: &str) -> Option<String> {
+    fn return_stamp_file_value(file: &str, word: &str) -> Option<String> {
         let created = file
             .lines()
             .find(|line| line.starts_with(word))
             .and_then(|l| l.split_whitespace().nth(1));
 
-        let value = created.map(|s| s.to_string());
-
-        value
+        created.map(|s| s.to_string())
     }
 
     /// Call to the crates.io api and return the latest version of `wasm-pack`