Move Hash back to derive.

arn/src/arn.rs

@@ -20,7 +20,7 @@ use {
 /// ARNs used to match resource statements, see [ArnPattern].
 ///
 /// [Arn] objects are immutable.
-#[derive(Debug, Clone, Eq, Ord, PartialEq, PartialOrd)]
+#[derive(Debug, Clone, Eq, Hash, Ord, PartialEq, PartialOrd)]
 pub struct Arn {
     partition: String,
     service: String,
@@ -29,17 +29,6 @@ pub struct Arn {
     resource: String,
 }
 
-#[allow(clippy::derive_hash_xor_eq)]
-impl Hash for Arn {
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        self.partition.hash(state);
-        self.service.hash(state);
-        self.region.hash(state);
-        self.account_id.hash(state);
-        self.resource.hash(state);
-    }
-}
-
 impl Arn {
     /// Create a new ARN from the specified components.
     ///