diff --git a/benches/compilation_benchmark.rs b/benches/compilation_benchmark.rs
index 1b11699..25a6964 100644
--- a/benches/compilation_benchmark.rs
+++ b/benches/compilation_benchmark.rs
@@ -98,7 +98,8 @@ fn bench_optimizer(c: &mut Criterion) {
         b.iter(|| {
             let mut prog_copy = black_box(program.clone());
             let mut optimizer = Optimizer::new(OptimizationLevel::None);
-            black_box(optimizer.optimize(&mut prog_copy).unwrap());
+            optimizer.optimize(&mut prog_copy).unwrap();
+            black_box(());
         })
     });
 
@@ -106,7 +107,8 @@ fn bench_optimizer(c: &mut Criterion) {
         b.iter(|| {
             let mut prog_copy = black_box(program.clone());
             let mut optimizer = Optimizer::new(OptimizationLevel::Moderate);
-            black_box(optimizer.optimize(&mut prog_copy).unwrap());
+            optimizer.optimize(&mut prog_copy).unwrap();
+            black_box(());
         })
     });
 
@@ -114,7 +116,8 @@ fn bench_optimizer(c: &mut Criterion) {
         b.iter(|| {
             let mut prog_copy = black_box(program.clone());
             let mut optimizer = Optimizer::new(OptimizationLevel::Aggressive);
-            black_box(optimizer.optimize(&mut prog_copy).unwrap());
+            optimizer.optimize(&mut prog_copy).unwrap();
+            black_box(());
         })
     });
 }
diff --git a/src/codegen.rs b/src/codegen.rs
index 34c79b9..9ad6a30 100644
--- a/src/codegen.rs
+++ b/src/codegen.rs
@@ -1267,7 +1267,7 @@ impl CodeGenerator {
 
         match self.target {
             Target::I386 | Target::Amd64 => {
-                self.emit_line(&format!("    test eax, eax"));
+                self.emit_line("    test eax, eax");
                 self.emit_line(&format!("    {} {}", instruction, label));
             }
             Target::Arm64 => {
diff --git a/src/compiler.rs b/src/compiler.rs
index fcd32f9..acdc800 100644
--- a/src/compiler.rs
+++ b/src/compiler.rs
@@ -119,7 +119,7 @@ impl Compiler {
             let preprocessed = self.preprocess(&source, input_file).await?;
             fs::write(&output_path, preprocessed)
                 .await
-                .map_err(|e| AleccError::IoError(e))?;
+                .map_err(AleccError::IoError)?;
             return Ok(output_path);
         } else {
             self.preprocess(&source, input_file).await?
@@ -149,7 +149,7 @@ impl Compiler {
             let output_path = self.get_output_path(input_file, "s")?;
             fs::write(&output_path, assembly)
                 .await
-                .map_err(|e| AleccError::IoError(e))?;
+                .map_err(AleccError::IoError)?;
             return Ok(output_path);
         }
 
@@ -157,7 +157,7 @@ impl Compiler {
         let asm_path = self.create_temp_file("s")?;
         fs::write(&asm_path, assembly)
             .await
-            .map_err(|e| AleccError::IoError(e))?;
+            .map_err(AleccError::IoError)?;
 
         // Assemble
         let obj_path = self.assemble_file(&asm_path).await?;
@@ -215,9 +215,9 @@ impl Compiler {
                         // Skip malformed include
                     }
                 }
-            } else if trimmed.starts_with("#define") {
+            } else if let Some(stripped) = trimmed.strip_prefix("#define") {
                 // Handle #define (simplified)
-                let parts: Vec<&str> = trimmed[7..].split_whitespace().collect();
+                let parts: Vec<&str> = stripped.split_whitespace().collect();
                 if !parts.is_empty() {
                     let key = parts[0].to_string();
                     let value = if parts.len() > 1 {
@@ -330,17 +330,17 @@ impl Compiler {
 
         match self.target {
             Target::I386 => {
-                command.args(&["--32"]);
+                command.args(["--32"]);
             }
             Target::Amd64 => {
-                command.args(&["--64"]);
+                command.args(["--64"]);
             }
             Target::Arm64 => {
                 // Default options for aarch64
             }
         }
 
-        command.args(&[
+        command.args([
             "-o",
             &obj_path.to_string_lossy(),
             &asm_file.to_string_lossy(),
diff --git a/src/linker.rs b/src/linker.rs
index 8669b76..98c1cf9 100644
--- a/src/linker.rs
+++ b/src/linker.rs
@@ -218,7 +218,7 @@ impl Linker {
         Ok(command)
     }
 
-    fn add_standard_startup_files(&self, _command: &mut Vec<String>) -> Result<()> {
+    fn add_standard_startup_files(&self, _command: &mut [String]) -> Result<()> {
         // Skip startup files when we have our own _start
         // This prevents conflicts with our custom _start implementation
         Ok(())
@@ -257,7 +257,7 @@ impl Linker {
     fn get_gcc_lib_path(&self) -> Result<String> {
         // Try to find GCC library path
         let output = Command::new("gcc")
-            .args(&["-print-libgcc-file-name"])
+            .args(["-print-libgcc-file-name"])
             .output()
             .map_err(|e| AleccError::LinkerError {
                 message: format!("Failed to find GCC library path: {}", e),