FIX: Removes unused code

base/src/expressions/lexer/mod.rs

@@ -140,7 +140,7 @@ impl Lexer {
     pub fn expect(&mut self, tk: TokenType) -> Result<()> {
         let nt = self.next_token();
         if index(&nt) != index(&tk) {
-            return Err(self.set_error(&format!("Error, expected {}", tk), self.position));
+            return Err(self.set_error(&format!("Error, expected {:?}", tk), self.position));
         }
         Ok(())
     }

base/src/expressions/lexer/util.rs

@@ -80,8 +80,3 @@ pub fn get_tokens(formula: &str) -> Vec<MarkedToken> {
     tokens
 }
 
-impl fmt::Display for MarkedToken {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        write!(fmt, "{}", self.token)
-    }
-}