make Clippy happy

src/lib.rs

@@ -70,29 +70,35 @@ impl Bencher {
     }
 
     fn dump(&self, label: &str, times: &[u128], append: bool) {
-        let output = format!("{}", label! { label: label, name: self.name, times: times });
+        let output = label! { label: label, name: self.name, times: times }.to_string();
         if let Some(path) = &self.file {
-            create_dir_all(path.parent().unwrap()).expect(&format!(
+            create_dir_all(path.parent().unwrap()).unwrap_or_else(|_| {
+                panic!(
                     "{}: could not create parent directory of log file '{}'",
                     self.name,
                     path.to_str().unwrap()
-            ));
+                )
+            });
             let mut f = File::options()
                 .write(true)
                 .append(append)
                 .truncate(!append)
                 .create(true)
                 .open(path)
-                .expect(&format!(
+                .unwrap_or_else(|_| {
+                    panic!(
                         "{}: could not open log file '{}'",
                         self.name,
                         path.to_str().unwrap()
-                ));
-            writeln!(&mut f, "{}", output).expect(&format!(
+                    )
+                });
+            writeln!(&mut f, "{}", output).unwrap_or_else(|_| {
+                panic!(
                     "{}: could not write to log file '{}'",
                     self.name,
                     path.to_str().unwrap()
-            ));
+                )
+            });
         } else {
             println!("{}", output);
         }