fix some warnings

pallets/maintenance-mode/src/types.rs

@@ -119,7 +119,7 @@ impl<T: frame_system::Config> frame_support::traits::TryState<BlockNumberOf<T>>
 	fn try_state(
 		_: BlockNumberOf<T>,
 		_: frame_support::traits::TryStateSelect,
-	) -> Result<(), &'static str> {
+	) -> Result<(), sp_runtime::DispatchError> {
 		Ok(())
 	}
 }

pallets/randomness/src/benchmarks.rs

@@ -141,9 +141,9 @@ benchmarks! {
 	}
 	verify {
 		// verify VrfOutput was inserted into storage as expected
-		let pubkey = sp_consensus_vrf::schnorrkel::PublicKey::from_bytes(vrf_id.as_slice())
+		let pubkey = sp_consensus_babe::schnorrkel::PublicKey::from_bytes(vrf_id.as_slice())
 			.expect("Expect VrfId is valid schnorrkel Public key");
-		let vrf_output: sp_consensus_vrf::schnorrkel::Randomness = vrf_pre_digest.vrf_output
+		let vrf_output: sp_consensus_babe::schnorrkel::Randomness = vrf_pre_digest.vrf_output
 			.attach_input_hash(&pubkey, transcript)
 			.ok()
 			.map(|inout| inout.make_bytes(&session_keys_primitives::VRF_INOUT_CONTEXT))

primitives/nimbus-primitives/src/lib.rs

@@ -26,7 +26,7 @@ use sp_runtime::generic::DigestItem;
 use sp_runtime::traits::BlockNumberProvider;
 use sp_runtime::ConsensusEngineId;
 #[cfg(feature = "runtime-benchmarks")]
-use sp_std::vec::{self, Vec};
+use sp_std::vec::Vec;
 
 pub mod digests;
 mod inherents;
@@ -114,7 +114,7 @@ impl SlotBeacon for IntervalBeacon {
 pub trait CanAuthor<AuthorId> {
 	#[cfg(feature = "try-runtime")]
 	// With `try-runtime` the local author should always be able to author a block.
-	fn can_author(author: &AuthorId, slot: &u32) -> bool {
+	fn can_author(_author: &AuthorId, _slot: &u32) -> bool {
 		true
 	}
 	#[cfg(not(feature = "try-runtime"))]