diff --git a/interpreter/src/lib.rs b/interpreter/src/lib.rs
index 3117ef9..7c9f462 100644
--- a/interpreter/src/lib.rs
+++ b/interpreter/src/lib.rs
@@ -24,4 +24,5 @@ impl Interpreter {
 }
 
 #[derive(Debug, thiserror::Error)]
+#[allow(dead_code)]
 enum InterpreterError {}
diff --git a/lexer/src/lib.rs b/lexer/src/lib.rs
index 8f1748e..cc8de2d 100644
--- a/lexer/src/lib.rs
+++ b/lexer/src/lib.rs
@@ -3,7 +3,6 @@
 // For the full copyright and license information, please view the LICENSE
 // files that was distributed with this source code.
 
-
 #[cfg(test)]
 mod tests;
 
diff --git a/lexer/src/tests.rs b/lexer/src/tests.rs
new file mode 100644
index 0000000..b36f74b
--- /dev/null
+++ b/lexer/src/tests.rs
@@ -0,0 +1 @@
+// Placeholder: real tests to be added.
diff --git a/src/utils.rs b/src/utils.rs
index 5735394..cada99c 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -10,7 +10,7 @@ use std::process::exit;
 use color_eyre::config::HookBuilder;
 use rustix::process::{EXIT_FAILURE, EXIT_SUCCESS};
 use tracing_error::ErrorLayer;
-use tracing_subscriber::{EnvFilter, prelude::*};
+use tracing_subscriber::prelude::*;
 
 type ExitCode = i32;
 
@@ -60,6 +60,7 @@ pub fn ensure_consistent_panic<T>(f: impl UnwindSafe + FnOnce() -> T) -> T {
 }
 
 /// Exits with a custom exit code or libc's codes, as per POSIX.
+#[allow(dead_code)]
 pub fn exit_with(res: Result<Option<impl Into<ExitCode>>, impl Display + Debug>) -> ! {
     let code = match res {
         Ok(Some(x)) => x.into(),