fix warnings in src/atom/mod.rs

src/atom/mod.rs

@@ -646,14 +646,6 @@ mod test {
 
     use crate::Parseable;
 
-    macro_rules! assert_eq_display {
-        ($a:expr, $b:expr) => {
-            if $a != $b {
-                panic!("{} != {}", $a, $b);
-            }
-        };
-    }
-
     macro_rules! assert_cmp_display {
         ($a:expr, $b:expr, $ordering:expr) => {
             if $a.cmp(&$b) != $ordering {
@@ -768,6 +760,7 @@ mod test {
             .parse_finished(InputIter::new("1.2.0a_alpha1_beta2-r1-8"))
             .unwrap();
 
+        #[allow(clippy::single_element_loop)]
         for (version_str, expected) in [("1.2.0", Ordering::Greater)] {
             let version = Version::parser()
                 .parse_finished(InputIter::new(version_str))