diff --git a/src/error.rs b/src/error.rs
index 24cd96d..bc0ea39 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -10,7 +10,6 @@ pub struct Error {
 
 #[derive(Debug)]
 pub enum ErrorKind {
-    SyntaxError(String),
     UnexpectedEof,
     UnexpectedToken(Token),
     UnknownVariable(String),
@@ -48,7 +47,6 @@ impl std::error::Error for Error {}
 impl Display for ErrorKind {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            ErrorKind::SyntaxError(desc) => write!(f, "syntax error: {}", desc),
             ErrorKind::UnexpectedEof => write!(f, "unexpected end of file"),
             ErrorKind::UnexpectedToken(token) => write!(f, "unexpected token {:?}", token),
             ErrorKind::UnknownVariable(name) => write!(f, "unknown identifier \"{}\"", name),
diff --git a/src/interpret.rs b/src/interpret.rs
index b0b5049..f4052ab 100644
--- a/src/interpret.rs
+++ b/src/interpret.rs
@@ -138,8 +138,8 @@ impl ExecEnv {
 
         Ok(match &expr.kind {
             BinOp { lhs, rhs, kind } => {
-                let lhs = self.eval_expr(&lhs)?;
-                let rhs = self.eval_expr(&rhs)?;
+                let lhs = self.eval_expr(lhs)?;
+                let rhs = self.eval_expr(rhs)?;
                 match kind {
                     // Arithmetic operators.
                     Add | Subtract | Multiply | Divide => {
@@ -193,7 +193,7 @@ impl ExecEnv {
                     }
                 }
             }
-            Not(expr) => Bool(!self.eval_expr(&expr)?.into_bool()),
+            Not(expr) => Bool(!self.eval_expr(expr)?.into_bool()),
             Literal(value) => value.clone(),
             ExprKind::Cart(members) => Value::Cart(
                 members
@@ -268,10 +268,10 @@ impl ExecEnv {
                 }
             }
             StmtKind::Call { iden, args } => {
-                let func = self.get_var(&iden)?;
+                let func = self.get_var(iden)?;
 
                 if let Value::Functio(func) = func {
-                    self.fn_call(func, &args, &stmt.span)?;
+                    self.fn_call(func, args, &stmt.span)?;
                 } else {
                     // Fail silently for now.
                 }
@@ -286,7 +286,7 @@ impl ExecEnv {
             },
             StmtKind::Assign { iden, value } => {
                 let value = self.eval_expr(value)?;
-                self.get_var_mut(&iden)?.value.replace(value);
+                self.get_var_mut(iden)?.value.replace(value);
             }
             StmtKind::Break => {
                 return Ok(HaltStatus::Break(stmt.span.clone()));
@@ -295,7 +295,7 @@ impl ExecEnv {
                 return Ok(HaltStatus::Hopback(stmt.span.clone()));
             }
             StmtKind::Melo(iden) => {
-                self.get_var_mut(&iden)?.melo = true;
+                self.get_var_mut(iden)?.melo = true;
             }
             StmtKind::Rlyeh => {
                 // Maybe print a creepy error message or something
@@ -314,7 +314,7 @@ impl ExecEnv {
                     value += self.get_bit()? as i32;
                 }
 
-                self.get_var_mut(&iden)?.value.replace(Value::Int(value));
+                self.get_var_mut(iden)?.value.replace(Value::Int(value));
             }
         }
 
diff --git a/src/repl.rs b/src/repl.rs
index a8afae0..af084b5 100644
--- a/src/repl.rs
+++ b/src/repl.rs
@@ -21,7 +21,7 @@ pub fn repl(ast_print: bool) {
                     break;
                 }
                 
-                let mut parser = Parser::new(&line);
+                let mut parser = Parser::new(line);
                 let value = parser.init().and_then(|ast| {
                     if ast_print {
                         println!("{:#?}", &ast);
diff --git a/src/variables.rs b/src/variables.rs
index 6a213c5..3fda15d 100644
--- a/src/variables.rs
+++ b/src/variables.rs
@@ -122,7 +122,7 @@ impl Value {
     /// Coerce a Value to a boolean. The conversion cannot fail.
     pub fn into_bool(&self) -> bool {
         match self {
-            Value::Abool(b) => b.clone().into(),
+            Value::Abool(b) => (*b).into(),
             Value::Bool(b) => *b,
             Value::Functio(_) => true,
             Value::Int(x) => *x != 0,
@@ -138,13 +138,13 @@ impl Value {
             Value::Nul => Value::Nul,
             Value::Str(s) => Value::Int(s.as_bytes()[index.into_i32() as usize] as i32),
             Value::Int(i) => Value::Int(
-                (format!("{}", i).as_bytes()[index.into_i32() as usize] - ('0' as u8)) as i32,
+                (format!("{}", i).as_bytes()[index.into_i32() as usize] - b'0') as i32,
             ),
             Value::Bool(b) => Value::Int(
                 format!("{}", b)
                     .chars()
                     .nth(index.into_i32() as usize)
-                    .unwrap_or_else(|| '?') as i32,
+                    .unwrap_or('?') as i32,
             ),
             Value::Abool(b) => Value::Int(*b as i32),
             Value::Functio(_) => Value::Int(42),