diff --git a/core/sr-primitives/src/traits.rs b/core/sr-primitives/src/traits.rs
index dd41c3f6854d6..92c8026340bf4 100644
--- a/core/sr-primitives/src/traits.rs
+++ b/core/sr-primitives/src/traits.rs
@@ -288,56 +288,39 @@ pub trait OffchainWorker<BlockNumber> {
 impl<N> OffchainWorker<N> for () {}
 
 macro_rules! tuple_impl {
-	($one:ident,) => {
-		impl<Number: Copy, $one: OnFinalize<Number>> OnFinalize<Number> for ($one,) {
-			fn on_finalize(n: Number) {
-				$one::on_finalize(n);
-			}
-		}
-		impl<Number: Copy, $one: OnInitialize<Number>> OnInitialize<Number> for ($one,) {
-			fn on_initialize(n: Number) {
-				$one::on_initialize(n);
-			}
-		}
-		impl<Number: Copy, $one: OffchainWorker<Number>> OffchainWorker<Number> for ($one,) {
-			fn generate_extrinsics(n: Number) {
-				$one::generate_extrinsics(n);
-			}
-		}
-	};
 	($first:ident, $($rest:ident,)+) => {
+		tuple_impl!([$first] [$first] [$($rest)+]);
+	};
+	([$($direct:ident)+] [$($reverse:ident)+] []) => {
 		impl<
 			Number: Copy,
-			$first: OnFinalize<Number>,
-			$($rest: OnFinalize<Number>),+
-		> OnFinalize<Number> for ($first, $($rest),+) {
+			$($direct: OnFinalize<Number>),+
+		> OnFinalize<Number> for ($($direct),+,) {
 			fn on_finalize(n: Number) {
-				$first::on_finalize(n);
-				$($rest::on_finalize(n);)+
+				$($reverse::on_finalize(n);)+
 			}
 		}
 		impl<
 			Number: Copy,
-			$first: OnInitialize<Number>,
-			$($rest: OnInitialize<Number>),+
-		> OnInitialize<Number> for ($first, $($rest),+) {
+			$($direct: OnInitialize<Number>),+
+		> OnInitialize<Number> for ($($direct),+,) {
 			fn on_initialize(n: Number) {
-				$first::on_initialize(n);
-				$($rest::on_initialize(n);)+
+				$($direct::on_initialize(n);)+
 			}
 		}
 		impl<
 			Number: Copy,
-			$first: OffchainWorker<Number>,
-			$($rest: OffchainWorker<Number>),+
-		> OffchainWorker<Number> for ($first, $($rest),+) {
+			$($direct: OffchainWorker<Number>),+
+		> OffchainWorker<Number> for ($($direct),+,) {
 			fn generate_extrinsics(n: Number) {
-				$first::generate_extrinsics(n);
-				$($rest::generate_extrinsics(n);)+
+				$($direct::generate_extrinsics(n);)+
 			}
 		}
-		tuple_impl!($($rest,)+);
-	}
+	};
+	([$($direct:ident)+] [$($reverse:ident)+] [$first:ident $($rest:ident)*]) => {
+		tuple_impl!([$($direct)+] [$($reverse)+] []);
+		tuple_impl!([$($direct)+ $first] [$first $($reverse)+] [$($rest)*]);
+	};
 }
 
 #[allow(non_snake_case)]
diff --git a/node/executor/src/lib.rs b/node/executor/src/lib.rs
index 9fe26123ff43d..fac04de6e7f91 100644
--- a/node/executor/src/lib.rs
+++ b/node/executor/src/lib.rs
@@ -37,14 +37,14 @@ mod tests {
 	use primitives::{twox_128, blake2_256, Blake2Hasher, ChangesTrieConfiguration, NeverNativeValue,
 		NativeOrEncoded};
 	use node_primitives::{Hash, BlockNumber, AccountId};
-	use runtime_primitives::traits::{Header as HeaderT, Hash as HashT};
-	use runtime_primitives::{generic, generic::Era, ApplyOutcome, ApplyError, ApplyResult, Perbill};
+	use runtime_primitives::traits::{Header as HeaderT, Hash as HashT, Digest, DigestItem};
+	use runtime_primitives::{generic::Era, ApplyOutcome, ApplyError, ApplyResult, Perbill};
 	use {balances, indices, session, system, staking, consensus, timestamp, treasury, contract};
 	use contract::ContractAddressFor;
 	use system::{EventRecord, Phase};
 	use node_runtime::{Header, Block, UncheckedExtrinsic, CheckedExtrinsic, Call, Runtime, Balances,
 		BuildStorage, GenesisConfig, BalancesConfig, SessionConfig, StakingConfig, System,
-		SystemConfig, GrandpaConfig, IndicesConfig, Event, Log};
+		SystemConfig, GrandpaConfig, IndicesConfig, Event};
 	use wabt;
 	use primitives::map;
 
@@ -442,8 +442,10 @@ mod tests {
 			]
 		);
 
-		let digest = generic::Digest::<Log>::default();
-		assert_eq!(Header::decode(&mut &block2.0[..]).unwrap().digest, digest);
+		// session change => consensus authorities change => authorities change digest item appears
+		let digest = Header::decode(&mut &block2.0[..]).unwrap().digest;
+		assert_eq!(digest.logs().len(), 1);
+		assert!(digest.logs()[0].as_authorities_change().is_some());
 
 		(block1, block2)
 	}
@@ -567,10 +569,6 @@ mod tests {
 					phase: Phase::ApplyExtrinsic(2),
 					event: Event::system(system::Event::ExtrinsicSuccess)
 				},
-				EventRecord {
-					phase: Phase::Finalization,
-					event: Event::session(session::RawEvent::NewSession(1))
-				},
 				EventRecord {
 					phase: Phase::Finalization,
 					event: Event::treasury(treasury::RawEvent::Spending(0))
@@ -583,6 +581,10 @@ mod tests {
 					phase: Phase::Finalization,
 					event: Event::treasury(treasury::RawEvent::Rollover(0))
 				},
+				EventRecord {
+					phase: Phase::Finalization,
+					event: Event::session(session::RawEvent::NewSession(1))
+				},
 			]);
 		});
 	}
diff --git a/node/runtime/src/lib.rs b/node/runtime/src/lib.rs
index a2d9a310cb0f4..2adbdd0504a2a 100644
--- a/node/runtime/src/lib.rs
+++ b/node/runtime/src/lib.rs
@@ -58,8 +58,8 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("node"),
 	impl_name: create_runtime_str!("substrate-node"),
 	authoring_version: 10,
-	spec_version: 75,
-	impl_version: 75,
+	spec_version: 76,
+	impl_version: 76,
 	apis: RUNTIME_API_VERSIONS,
 };