diff --git a/Cargo.lock b/Cargo.lock
index fe91f25..21f4c74 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -214,7 +214,6 @@ dependencies = [
  "clap-verbosity-flag",
  "emacs",
  "env_logger",
- "lazy_static",
  "log",
  "serde",
  "serde_json",
@@ -326,12 +325,6 @@ version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
 
-[[package]]
-name = "lazy_static"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
-
 [[package]]
 name = "libc"
 version = "0.2.153"
diff --git a/Cargo.toml b/Cargo.toml
index 131f442..86eea92 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,6 @@ edition = "2021"
 serde = { version = "1.0", features = ["derive"]}
 serde_json = "1.0"
 anyhow = "1.0"
-lazy_static = "1.4"
 smallvec = "1.11"
 env_logger = "0.10"
 log = "0.4.20"
diff --git a/src/bytecode.rs b/src/bytecode.rs
index 796a88e..9ce939e 100644
--- a/src/bytecode.rs
+++ b/src/bytecode.rs
@@ -182,7 +182,7 @@ impl Op {
             &Self::StackRef(v) if (1..=4).contains(&v) =>
                 Ok(smallvec![v as u8]),
             &Self::StackRef(_) => unimplemented!(),
-            &Self::List(v) if v == 0 => unreachable!(),
+            &Self::List(0) => unreachable!(),
             &Self::List(v) if (1..=4).contains(&v) => Ok(smallvec![66 + v]),
             &Self::List(v) => Ok(smallvec![175, v]),
             &Self::Discard => Ok(smallvec![136]),
diff --git a/tests/app_test.rs b/tests/app_test.rs
index fdb9be2..c1a5c57 100644
--- a/tests/app_test.rs
+++ b/tests/app_test.rs
@@ -1,6 +1,4 @@
 use anyhow::Result;
-use tempfile;
-use env_logger;
 
 use emacs_lsp_booster::{app, rpcio};
 
@@ -23,7 +21,7 @@ fn test_app_with_echo_server() -> Result<()> {
     });
 
     let mut cmd = std::process::Command::new("timeout");
-    cmd.args(&["1", "cat"]);
+    cmd.args(["1", "cat"]);
 
     let exit_status = app::run_app_forever(input_pair_out, output_file, cmd, app::AppOptions {
         bytecode_options: Some(Default::default()),
diff --git a/tests/bytecode_test.rs b/tests/bytecode_test.rs
index dad11ac..ea34a72 100644
--- a/tests/bytecode_test.rs
+++ b/tests/bytecode_test.rs
@@ -1,6 +1,5 @@
 use serde_json as json;
 use anyhow::Result;
-use tempfile;
 
 use emacs_lsp_booster::bytecode;
 
@@ -9,7 +8,7 @@ fn run_one_test(json_str: &str, object_type: bytecode::ObjectType) -> Result<()>
     let json_value: json::Value = json::from_str(json_str)?;
     let json_str_nowhitespaces = json_value.to_string();
     let bytecode = bytecode::generate_bytecode_repl(&json_value, bytecode::BytecodeOptions {
-        object_type: object_type.clone(),
+        object_type,
         ..Default::default()
     })?;
 
@@ -52,9 +51,9 @@ fn test_bytecode() {
     // unicode test
     run_one_test(r#"{"a":"ÀÁÂÃÄÅÆÇÈÉÊËÌ abcd \n 你好世界"}"#, bytecode::ObjectType::Plist).unwrap();
 
-    for object_type in vec![bytecode::ObjectType::Plist,
-                            bytecode::ObjectType::Alist,
-                            bytecode::ObjectType::Hashtable] {
+    for object_type in [bytecode::ObjectType::Plist,
+                        bytecode::ObjectType::Alist,
+                        bytecode::ObjectType::Hashtable] {
         eprintln!("Testing completion.json (~100KB), object type = {:?}", object_type);
         run_one_test(include_str!("./data/completion.json"), object_type).unwrap();