diff --git a/src/build.rs b/src/build.rs
index 180cce0..02566e2 100644
--- a/src/build.rs
+++ b/src/build.rs
@@ -44,9 +44,8 @@ pub fn create_static_output_files(source_dir: &str) {
       }
     }
     Err(err) => {
-      if err.kind() == NotFound {
-      } else {
-        Err(err).unwrap()
+      if err.kind() != NotFound {
+        panic!("Unexpected error: {}", err)
       }
     }
   }
diff --git a/src/command_runner.rs b/src/command_runner.rs
index b672a4c..5f37ca1 100644
--- a/src/command_runner.rs
+++ b/src/command_runner.rs
@@ -181,7 +181,7 @@ where
 {
   async fn run(&self, program: &str, args: &[&OsStr], input: &str) -> IoResult<Output> {
     let raw_new_args = [self.user_name, "-s", "/usr/bin/env", "--", program];
-    let mut new_args: Vec<&OsStr> = raw_new_args.iter().map(|s| s.as_ref()).collect();
+    let mut new_args: Vec<&OsStr> = raw_new_args.iter().map(AsRef::as_ref).collect();
     new_args.extend_from_slice(args);
     self.command_runner.run("su", &new_args, input).await
   }