clean up warning

src/token.rs

@@ -17,16 +17,11 @@ pub enum TokenType {
 
 pub struct Token {
     pub line: usize,
-    pub lexeme: String,
     pub token_type: TokenType,
 }
 
 impl Token {
-    pub fn new(token_type: TokenType, lexeme: String, line: usize) -> Self {
-        Self {
-            line,
-            lexeme,
-            token_type,
-        }
+    pub fn new(token_type: TokenType, _lexeme: String, line: usize) -> Self {
+        Self { line, token_type }
     }
 }