Removed many pointless calls to *iter() and iter_mut()

src/libstd/net/parser.rs

@@ -63,7 +63,7 @@ impl<'a> Parser<'a> {
     // Return result of first successful parser
     fn read_or<T>(&mut self, parsers: &mut [Box<FnMut(&mut Parser) -> Option<T> + 'static>])
                -> Option<T> {
-        for pf in parsers.iter_mut() {
+        for pf in parsers {
             match self.read_atomically(|p: &mut Parser| pf(p)) {
                 Some(r) => return Some(r),
                 None => {}