Shifting and naming.

src/syntax/tokens.rs

@@ -89,7 +89,7 @@ impl fmt::Display for Token {
 pub enum Lexer<'a> {
     Working(LexerState<'a>),
     Errored(LexerError),
-    Done(usize),
+    Done,
 }
 
 struct LexerState<'a> {
@@ -120,7 +120,7 @@ impl<'a> Iterator for Lexer<'a> {
 
     fn next(&mut self) -> Option<Self::Item> {
         match self {
-            Lexer::Done(_) => None,
+            Lexer::Done => None,
             Lexer::Errored(e) => Some(Err(e.clone())),
             Lexer::Working(state) => match state.next_token() {
                 Err(e) => {
@@ -130,7 +130,7 @@ impl<'a> Iterator for Lexer<'a> {
                 }
 
                 Ok(None) => {
-                    *self = Lexer::Done(state.stream.offset());
+                    *self = Lexer::Done;
                     None
                 }