Parachains double vote handler initial implementation.

primitives/src/parachain.rs

@@ -580,7 +580,7 @@ pub struct Activity(#[cfg_attr(feature = "std", serde(with="bytes"))] pub Vec<u8
 
 /// Statements that can be made about parachain candidates. These are the
 /// actual values that are signed.
-#[derive(Clone, PartialEq, Eq, Encode)]
+#[derive(Clone, PartialEq, Eq, Encode, Decode)]
 #[cfg_attr(feature = "std", derive(Debug))]
 pub enum Statement {
 	/// Proposal of a parachain candidate.
@@ -596,8 +596,7 @@ pub enum Statement {
 
 /// An either implicit or explicit attestation to the validity of a parachain
 /// candidate.
-#[derive(Clone, PartialEq, Decode, Encode)]
-#[cfg_attr(feature = "std", derive(Debug))]
+#[derive(Clone, Eq, PartialEq, Decode, Encode, RuntimeDebug)]
 pub enum ValidityAttestation {
 	/// Implicit validity attestation by issuing.
 	/// This corresponds to issuance of a `Candidate` statement.

runtime/common/Cargo.toml

@@ -28,6 +28,7 @@ staking = { package = "pallet-staking", git = "https://github.com/paritytech/sub
 system = { package = "frame-system", git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 timestamp = { package = "pallet-timestamp", git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 vesting = { package = "pallet-vesting", git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+offences = { package = "pallet-offences", git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 
 primitives = { package = "polkadot-primitives", path = "../../primitives", default-features = false }