diff --git a/rust/src/scanner.rs b/rust/src/scanner.rs
index 8a25f04..25dc98c 100644
--- a/rust/src/scanner.rs
+++ b/rust/src/scanner.rs
@@ -67,7 +67,7 @@ impl<'a> Scanner<'a> {
         self.source.get(self.current + 1).map(|&x| x as char)
     }
 
-    fn string(&'a mut self) -> Token<'a> {
+    fn string(&mut self) -> Token<'a> {
         while matches!(self.peek(), Some(c) if c != '"') {
             if self.peek() == Some('\n') {
                 self.line += 1;
@@ -85,7 +85,7 @@ impl<'a> Scanner<'a> {
         self.make_token(TokenKind::String)
     }
 
-    fn number(&'a mut self) -> Token<'a> {
+    fn number(&mut self) -> Token<'a> {
         while matches!(self.peek(), Some(c) if c.is_ascii_digit()) {
             self.advance();
         }
@@ -102,7 +102,7 @@ impl<'a> Scanner<'a> {
         self.make_token(TokenKind::Number)
     }
 
-    fn identifier(&mut self) -> Token {
+    fn identifier(&mut self) -> Token<'a> {
         while matches!(self.peek(), Some(c) if is_alpha(c) || c.is_ascii_digit()) {
             self.advance();
         }
@@ -139,7 +139,7 @@ impl<'a> Scanner<'a> {
         }
     }
 
-    fn make_token(&'a self, kind: TokenKind) -> Token<'a> {
+    fn make_token(&self, kind: TokenKind) -> Token<'a> {
         Token {
             kind: TokenKind::And,
             value: std::str::from_utf8(&self.source[..self.current]).unwrap(),
@@ -156,18 +156,10 @@ impl<'a> Iterator for Scanner<'a> {
         self.peek()?;
 
         Some(match self.advance() {
-            // _ => self.make_token(TokenKind::And),
-            _ => Token {
-                kind: TokenKind::And,
-                value: std::str::from_utf8(&self.source[..self.current]).unwrap(),
-                line: self.line,
-            },
-        })
-
-        // Some(match self.advance() {
-        //     c if is_alpha(c) => self.identifier(),
-        //     c if c.is_ascii_digit() => self.number(),
-        //     '(' => self.make_token(TokenKind::LeftParen),
+            c if is_alpha(c) => self.identifier(),
+            c if c.is_ascii_digit() => self.number(),
+            // '(' => Token::new(self, TokenKind::LeftParen),
+            '(' => self.make_token(TokenKind::LeftParen),
         //     ')' => self.make_token(TokenKind::RightParen),
         //     '{' => self.make_token(TokenKind::LeftBrace),
         //     '}' => self.make_token(TokenKind::RightBrace),
@@ -207,8 +199,8 @@ impl<'a> Iterator for Scanner<'a> {
         //         }
         //     }
         //     '"' => self.string(),
-        //     _ => Token::error(&self, "Unexpected character."),
-        // })
+            _ => Token::error(self, "Unexpected character."),
+        })
     }
 }