type alias for Tokens

src/parser.rs

@@ -17,9 +17,10 @@ pub enum ParseResult {
     Err(String)
 }
 
+type Tokens<'a> = Iter<'a,Token>;
+
 macro_rules! expect {
     ($tok:expr, $tokens:expr) => ( if !expect_token($tok, $tokens) {
-        println!("yo hitting");
         return ParseResult::Err(format!("Expected {:?}", $tok));
     })
 }
@@ -36,7 +37,7 @@ pub fn parse(input: Vec<Token>) -> ParseResult {
     return ParseResult::Err("Bad parse".to_string());
 }
 
-fn expect_token(tok: Token, tokens: &mut Iter<Token>) -> bool {
+fn expect_token(tok: Token, tokens: &mut Tokens) -> bool {
     if let Some(n) = tokens.next() {
         let next = (*n).clone();
         return match (tok, next) {
@@ -55,7 +56,7 @@ fn expect_token(tok: Token, tokens: &mut Iter<Token>) -> bool {
     return false;
 }
 
-fn let_expression<'a>(input: &mut Iter<Token>) -> ParseResult {
+fn let_expression(input: &mut Tokens) -> ParseResult {
     expect!(Identifier("let".to_string()), input);
     if let Some(&Identifier(ref name)) = input.next() {
         if let Some(&Identifier(ref s)) = input.next() {