Kill some compiler warnings

src/schala_lang/eval.rs

@@ -121,7 +121,7 @@ impl<'a> State<'a> {
           };
         }
       },
-      Binding { name, constant, expr } => {
+      Binding { name, expr, ..} => {
         let val = self.eval_expr(expr)?;
         self.insert(name.clone(), ValueEntry::Binding { val });
       },

src/schala_lang/tokenizing.rs

@@ -1,10 +1,8 @@
 use itertools::Itertools;
 use std::collections::HashMap;
 use std::rc::Rc;
-use std::iter::{Iterator, Enumerate, Peekable, FlatMap};
-use std::str::{Lines, Chars};
+use std::iter::{Iterator, Peekable};
 use std::fmt;
-use std::fmt::Write;
 
 #[derive(Debug, PartialEq, Clone)]
 pub enum TokenType {
@@ -96,9 +94,6 @@ impl Token {
       _ => None,
     }
   }
-  pub fn to_string(&self) -> String {
-    format!("{}", self.token_type)
-  }
   pub fn to_string_with_metadata(&self) -> String {
     format!("{}(L:{},c:{})", self.token_type, self.offset.0, self.offset.1)
   }