diff --git a/src/ansi.rs b/src/ansi.rs
index 47bf6c9419..e25a8257d4 100644
--- a/src/ansi.rs
+++ b/src/ansi.rs
@@ -25,7 +25,7 @@ pub fn strip_ansi_codes(s: &str) -> Cow<str> {
 }
 
 pub fn use_color() -> bool {
-  *NO_COLOR == false
+  !(*NO_COLOR)
 }
 
 pub fn red_bold(s: String) -> impl fmt::Display {
diff --git a/src/js_errors.rs b/src/js_errors.rs
index bc7f376830..dccda0e5d2 100644
--- a/src/js_errors.rs
+++ b/src/js_errors.rs
@@ -115,7 +115,7 @@ impl fmt::Display for JSError {
               s.push(' ');
             }
           }
-          write!(f, "{}\n", ansi::red_bold(s))?;
+          writeln!(f, "{}", ansi::red_bold(s))?;
         }
       }
     }
@@ -193,7 +193,7 @@ impl StackFrame {
     Some(StackFrame {
       line: line - 1,
       column: column - 1,
-      script_name: script_name,
+      script_name,
       function_name,
       is_eval,
       is_constructor,
@@ -227,8 +227,8 @@ impl StackFrame {
             let orig_source = sm.sources[original.source as usize].clone();
             (
               orig_source,
-              original.original_line as i64,
-              original.original_column as i64,
+              i64::from(original.original_line),
+              i64::from(original.original_column),
             )
           }
         },
diff --git a/src/ops.rs b/src/ops.rs
index b30473eb6d..82d79fc2f2 100644
--- a/src/ops.rs
+++ b/src/ops.rs
@@ -184,11 +184,11 @@ fn op_now(
   assert_eq!(data.len(), 0);
   let start = SystemTime::now();
   let since_the_epoch = start.duration_since(UNIX_EPOCH).unwrap();
-  let time = since_the_epoch.as_secs() as u64 * 1000
-    + since_the_epoch.subsec_millis() as u64;
+  let time = since_the_epoch.as_secs() * 1000
+    + u64::from(since_the_epoch.subsec_millis());
 
   let builder = &mut FlatBufferBuilder::new();
-  let inner = msg::NowRes::create(builder, &msg::NowResArgs { time: time });
+  let inner = msg::NowRes::create(builder, &msg::NowResArgs { time });
   ok_future(serialize_response(
     base.cmd_id(),
     builder,
@@ -327,7 +327,6 @@ fn op_code_fetch(
       filename: Some(builder.create_string(&out.filename)),
       media_type: out.media_type,
       source_code: Some(builder.create_string(&out.source_code)),
-      ..Default::default()
     };
     let inner = msg::CodeFetchRes::create(builder, &msg_args);
     Ok(serialize_response(
@@ -622,9 +621,15 @@ fn op_chmod(
     #[cfg(any(unix))]
     {
       // We need to use underscore to compile in Windows.
-      #[cfg_attr(feature = "cargo-clippy", allow(used_underscore_binding))]
+      #[cfg_attr(
+        feature = "cargo-clippy",
+        allow(clippy::used_underscore_binding)
+      )]
       let mut permissions = _metadata.permissions();
-      #[cfg_attr(feature = "cargo-clippy", allow(used_underscore_binding))]
+      #[cfg_attr(
+        feature = "cargo-clippy",
+        allow(clippy::used_underscore_binding)
+      )]
       permissions.set_mode(_mode);
       fs::set_permissions(&path, permissions)?;
     }