Used checked next in require

ablescript/src/parser.rs

@@ -120,11 +120,10 @@ impl<'source> Parser<'source> {
     }
 
     /// Require next item to be equal with expected one
-    fn require(&mut self, expected: Token) -> Result<(), Error> {
-        match self.lexer.next() {
-            Some(t) if t == expected => Ok(()),
-            Some(t) => Err(Error::new(ErrorKind::UnexpectedToken(t), self.lexer.span())),
-            None => Err(Error::unexpected_eof(self.lexer.span().start)),
+    fn require(&mut self, required: Token) -> Result<(), Error> {
+        match self.checked_next()? {
+            t if t == required => Ok(()),
+            t => Err(Error::new(ErrorKind::UnexpectedToken(t), self.lexer.span())),
         }
     }