Operator only needs to be a tuple struct

src/parser.rs

@@ -111,7 +111,7 @@ impl Parser {
     }
 
     fn get_precedence(&self, op: &Op) -> Precedence {
-        match &op.repr[..] {
+        match &op.0[..] {
             "+" => 10,
             "-" => 10,
             "*" => 20,
@@ -297,7 +297,7 @@ impl Parser {
                 }
             }
 
-            lhs = Expression::BinExp(op.repr, Box::new(lhs), Box::new(rhs));
+            lhs = Expression::BinExp(op.0, Box::new(lhs), Box::new(rhs));
         }
 
         Ok(lhs)

src/tokenizer.rs

@@ -15,9 +15,7 @@ pub enum Token {
 }
 
 #[derive(Debug, Clone, PartialEq)]
-pub struct Op {
-    pub repr: String,
-}
+pub struct Op(pub String);
 
 #[derive(Debug, Clone, PartialEq)]
 pub enum Kw {
@@ -100,7 +98,7 @@ pub fn tokenize(input: &str) -> TokenizeResult {
                         break;
                     }
                 }
-                Operator(Op { repr: buffer })
+                Operator(Op(buffer))
             }
             c => {
                 if c == '.' && !iter.peek().map_or(false, |x| is_digit(x)) {