Don’t impl ‘Staking’ for all ‘T: System’

src/frame/staking.rs

@@ -114,7 +114,6 @@ impl Default for ValidatorPrefs {
 /// The subset of the `frame::Trait` that a client must implement.
 #[module]
 pub trait Staking: System {}
-impl<T: System> Staking for T {}
 
 /// Just a Balance/BlockNumber tuple to encode when a chunk of funds will be unlocked.
 #[derive(PartialEq, Eq, Clone, Encode, Decode)]

src/runtimes.rs

@@ -88,6 +88,8 @@ impl Session for KusamaRuntime {
     type ValidatorId = <Self as System>::AccountId;
 }
 
+impl Staking for KusamaRuntime {}
+
 impl Balances for KusamaRuntime {
     type Balance = u128;
 }