Iterate lexer

src/lexer.rs

@@ -28,6 +28,8 @@ impl Iterator for Lexer {
     type Item = Token;
 
     fn next(&mut self) -> Option<Token> {
+        let mut forward = self.index;
+        println!("Lexing '{}'", self.input);
         None
     }
 }

src/main.rs

@@ -6,4 +6,7 @@ fn main() {
     lexer::hello("Emily");
     let s = "Jonas".to_string();
     lexer::hello(&s);
+
+    let lexer = lexer::Lexer::new(String::from("((abc))"));
+    for t in lexer { }
 }