diff --git a/src/hyperfine/benchmark.rs b/src/hyperfine/benchmark.rs
index 6200c8e..652be22 100644
--- a/src/hyperfine/benchmark.rs
+++ b/src/hyperfine/benchmark.rs
@@ -53,7 +53,7 @@ pub fn time_shell_command(
 
     let duration = start.elapsed();
 
-    let execution_time = duration.as_secs() as f64 + duration.subsec_nanos() as f64 * 1e-9;
+    let execution_time = duration.as_secs() as f64 + (duration.subsec_nanos() as f64) * 1e-9;
 
     // Correct for shell spawning time
     let execution_time_corrected = if let Some(spawning_time) = shell_spawning_time {
@@ -75,7 +75,7 @@ pub fn time_shell_command(
 /// Measure the average shell spawning time
 pub fn mean_shell_spawning_time() -> io::Result<Second> {
     const COUNT: u64 = 200;
-    let bar = get_progress_bar(COUNT, "Measuring shell spawning time");
+    let progress_bar = get_progress_bar(COUNT, "Measuring shell spawning time");
 
     let mut times: Vec<Second> = vec![];
     for _ in 0..COUNT {
@@ -94,9 +94,9 @@ pub fn mean_shell_spawning_time() -> io::Result<Second> {
                 times.push(r.execution_time);
             }
         }
-        bar.inc(1);
+        progress_bar.inc(1);
     }
-    bar.finish_and_clear();
+    progress_bar.finish_and_clear();
 
     Ok(mean(&times))
 }
@@ -121,17 +121,17 @@ pub fn run_benchmark(
 
     // Warmup phase
     if options.warmup_count > 0 {
-        let bar = get_progress_bar(options.warmup_count, "Performing warmup runs");
+        let progress_bar = get_progress_bar(options.warmup_count, "Performing warmup runs");
 
         for _ in 0..options.warmup_count {
             let _ = time_shell_command(cmd, options.failure_action, None)?;
-            bar.inc(1);
+            progress_bar.inc(1);
         }
-        bar.finish_and_clear();
+        progress_bar.finish_and_clear();
     }
 
     // Set up progress bar (and spinner for initial measurement)
-    let bar = get_progress_bar(options.min_runs, "Initial time measurement");
+    let progress_bar = get_progress_bar(options.min_runs, "Initial time measurement");
 
     // Run init / cleanup command
     let run_preparation_command = || {
@@ -161,7 +161,7 @@ pub fn run_benchmark(
     all_succeeded = all_succeeded && res.success;
 
     // Re-configure the progress bar
-    bar.set_length(count_remaining);
+    progress_bar.set_length(count_remaining);
 
     // Gather statistics
     for _ in 0..count_remaining {
@@ -171,16 +171,16 @@ pub fn run_benchmark(
             let mean = format_duration(mean(&execution_times), None);
             format!("Current estimate: {}", Green.paint(mean))
         };
-        bar.set_message(&msg);
+        progress_bar.set_message(&msg);
 
         let res = time_shell_command(cmd, options.failure_action, Some(shell_spawning_time))?;
 
         execution_times.push(res.execution_time);
         all_succeeded = all_succeeded && res.success;
 
-        bar.inc(1);
+        progress_bar.inc(1);
     }
-    bar.finish_and_clear();
+    progress_bar.finish_and_clear();
 
     // Compute statistical quantities
     let t_mean = mean(&execution_times);
@@ -224,7 +224,7 @@ pub fn run_benchmark(
         warnings.push(Warnings::NonZeroExitCode);
     }
 
-    if warnings.len() > 0 {
+    if !warnings.is_empty() {
         eprintln!(" ");
         for warning in &warnings {
             eprintln!("  {}: {}", Yellow.paint("Warning"), warning);
diff --git a/src/hyperfine/internal.rs b/src/hyperfine/internal.rs
index ce47b48..0442f64 100644
--- a/src/hyperfine/internal.rs
+++ b/src/hyperfine/internal.rs
@@ -54,12 +54,12 @@ pub fn get_progress_bar(length: u64, msg: &str) -> ProgressBar {
         .tick_chars("⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏")
         .template(" {spinner} {msg:<30} {wide_bar} ETA {eta_precise}");
 
-    let bar = ProgressBar::new(length);
-    bar.set_style(progressbar_style.clone());
-    bar.enable_steady_tick(80);
-    bar.set_message(msg);
+    let progress_bar = ProgressBar::new(length);
+    progress_bar.set_style(progressbar_style.clone());
+    progress_bar.enable_steady_tick(80);
+    progress_bar.set_message(msg);
 
-    bar
+    progress_bar
 }
 
 /// Possible benchmark warnings
@@ -70,31 +70,29 @@ pub enum Warnings {
 
 impl fmt::Display for Warnings {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            &Warnings::FastExecutionTime => write!(
+        match *self {
+            Warnings::FastExecutionTime => write!(
                 f,
                 "Command took less than {:.0} ms to complete. Results might be inaccurate.",
                 MIN_EXECUTION_TIME * 1e3
             ),
-            &Warnings::NonZeroExitCode => write!(f, "Ignoring non-zero exit code."),
+            Warnings::NonZeroExitCode => write!(f, "Ignoring non-zero exit code."),
         }
     }
 }
 
 /// A max function for f64's without NaNs
 pub fn max(vals: &[f64]) -> f64 {
-    vals.iter()
+    *vals.iter()
         .max_by(|a, b| a.partial_cmp(b).unwrap())
         .unwrap()
-        .clone()
 }
 
 /// A min function for f64's without NaNs
 pub fn min(vals: &[f64]) -> f64 {
-    vals.iter()
+    *vals.iter()
         .min_by(|a, b| a.partial_cmp(b).unwrap())
         .unwrap()
-        .clone()
 }
 
 #[test]
diff --git a/src/main.rs b/src/main.rs
index ee81abe..89a4511 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -28,7 +28,7 @@ fn run(commands: &Vec<&str>, options: &HyperfineOptions) -> io::Result<()> {
 
     // Run the benchmarks
     for (num, cmd) in commands.iter().enumerate() {
-        run_benchmark(num, &cmd, shell_spawning_time, &options)?;
+        run_benchmark(num, cmd, shell_spawning_time, options)?;
     }
 
     Ok(())
@@ -116,8 +116,7 @@ fn main() {
     let commands = matches.values_of("command").unwrap().collect();
     let res = run(&commands, &options);
 
-    match res {
-        Err(e) => error(e.description()),
-        Ok(_) => {}
+    if let Err(e) = res {
+        error(e.description());
     }
 }