Merge pull request #2 from paritytech/a-wasm-authoring

Authoring with WASM runtime

Merge pull request #2 from paritytech/a-wasm-authoring
Authoring with WASM runtime
bf12c659 · Gav Wood · GitHub · bb5919da · 36b831a1 · bf12c659
Unverified Commit bf12c659 authored Sep 01, 2018 by Gav Wood Committed by GitHub Sep 01, 2018
--- a/api/Cargo.toml
+++ b/api/Cargo.toml
@@ -5,6 +5,7 @@ authors = ["Parity Technologies <admin@parity.io>"]

 [dependencies]
 error-chain = "0.12"
+log = "0.3"
 polkadot-executor = { path = "../executor" }
 polkadot-runtime = { path = "../runtime" }
 polkadot-primitives = { path = "../primitives" }
@@ -16,7 +17,6 @@ substrate-client = { git = "https://github.com/paritytech/substrate" }
 substrate-primitives = { git = "https://github.com/paritytech/substrate" }
 substrate-executor = { git = "https://github.com/paritytech/substrate" }
 substrate-state-machine = { git = "https://github.com/paritytech/substrate" }
-log = "0.3"

 [dev-dependencies]
 substrate-keyring = { git = "https://github.com/paritytech/substrate" }
--- a/api/src/full.rs
+++ b/api/src/full.rs
@@ -18,47 +18,67 @@

 use client::backend::LocalBackend;
 use client::block_builder::BlockBuilder as ClientBlockBuilder;
-use client::{Client, LocalCallExecutor};
+use client::{self, Client, LocalCallExecutor, CallExecutor};
+use codec::{Encode, Decode};
 use polkadot_executor::Executor as LocalDispatch;
 use substrate_executor::NativeExecutor;
-use state_machine;
+use state_machine::ExecutionManager;

 use runtime::Address;
-use runtime_primitives::traits::AuxLookup;
 use primitives::{
 	AccountId, Block, Header, BlockId, Hash, Index, InherentData,
 	SessionKey, Timestamp, UncheckedExtrinsic,
 };
 use primitives::parachain::{DutyRoster, Id as ParaId};
 use substrate_primitives::{KeccakHasher, RlpCodec};
-
-use {BlockBuilder, PolkadotApi, LocalPolkadotApi, ErrorKind, Error, Result};
-
-// set up the necessary scaffolding to execute a set of calls to the runtime.
-// this creates a new block on top of the given ID and initialises it.
-macro_rules! with_runtime {
-	($client: ident, $at: expr, $exec: expr) => {{
-		let parent = $at;
-		let header = Header {
-			parent_hash: $client.block_hash_from_id(&parent)?
-				.ok_or_else(|| ErrorKind::UnknownBlock(format!("{:?}", parent)))?,
-			number: $client.block_number_from_id(&parent)?
+use {BlockBuilder, PolkadotApi, LocalPolkadotApi, Error, ErrorKind, Result};
+
+fn call<B, R>(
+	client: &Client<B, LocalCallExecutor<B, NativeExecutor<LocalDispatch>>, Block>,
+	at: &BlockId,
+	function: &'static str,
+	input: &[u8])
+-> Result<R>
+where
+	R: Decode,
+	B: LocalBackend<Block, KeccakHasher, RlpCodec>,
+{
+	let parent = at;
+	let header = Header {
+		parent_hash: client.block_hash_from_id(&parent)?
+			.ok_or_else(|| ErrorKind::UnknownBlock(format!("{:?}", parent)))?,
+			number: client.block_number_from_id(&parent)?
 				.ok_or_else(|| ErrorKind::UnknownBlock(format!("{:?}", parent)))? + 1,
-			state_root: Default::default(),
-			extrinsics_root: Default::default(),
-			digest: Default::default(),
-		};
-
-		$client.state_at(&parent).map_err(Error::from).and_then(|state| {
-			let mut changes = Default::default();
-			let mut ext = state_machine::Ext::new(&mut changes, &state);
-
-			::substrate_executor::with_native_environment(&mut ext, || {
-				::runtime::Executive::initialise_block(&header);
-				($exec)()
-			}).map_err(Into::into)
-		})
-	}}
+				state_root: Default::default(),
+				extrinsics_root: Default::default(),
+				digest: Default::default(),
+	};
+	client.state_at(&parent).map_err(Error::from).and_then(|state| {
+		let mut overlay = Default::default();
+		let execution_manager = || ExecutionManager::Both(|wasm_result, native_result| {
+			warn!("Consensus error between wasm and native runtime execution at block {:?}", at);
+			warn!("   Function {:?}", function);
+			warn!("   Native result {:?}", native_result);
+			warn!("   Wasm result {:?}", wasm_result);
+			wasm_result
+		});
+		client.executor().call_at_state(
+			&state,
+			&mut overlay,
+			"initialise_block",
+			&header.encode(),
+			execution_manager()
+		)?;
+		let (r, _) = client.executor().call_at_state(
+			&state,
+			&mut overlay,
+			function,
+			input,
+			execution_manager()
+		)?;
+		Ok(R::decode(&mut &r[..])
+		   .ok_or_else(|| client::error::Error::from(client::error::ErrorKind::CallResultDecode(function)))?)
+	})
 }

 impl<B: LocalBackend<Block, KeccakHasher, RlpCodec>> BlockBuilder for ClientBlockBuilder<B, LocalCallExecutor<B, NativeExecutor<LocalDispatch>>, Block, KeccakHasher, RlpCodec> {
@@ -76,79 +96,63 @@ impl<B: LocalBackend<Block, KeccakHasher, RlpCodec>> PolkadotApi for Client<B, L
 	type BlockBuilder = ClientBlockBuilder<B, LocalCallExecutor<B, NativeExecutor<LocalDispatch>>, Block, KeccakHasher, RlpCodec>;

 	fn session_keys(&self, at: &BlockId) -> Result<Vec<SessionKey>> {
-		with_runtime!(self, at, ::runtime::Consensus::authorities)
+		Ok(self.authorities_at(at)?)
 	}

 	fn validators(&self, at: &BlockId) -> Result<Vec<AccountId>> {
-		with_runtime!(self, at, ::runtime::Session::validators)
+		call(self, at, "validators", &[])
 	}

 	fn random_seed(&self, at: &BlockId) -> Result<Hash> {
-		with_runtime!(self, at, ::runtime::System::random_seed)
+		call(self, at, "random_seed", &[])
 	}

 	fn duty_roster(&self, at: &BlockId) -> Result<DutyRoster> {
-		with_runtime!(self, at, ::runtime::Parachains::calculate_duty_roster)
+		call(self, at, "duty_roster", &[])
 	}

 	fn timestamp(&self, at: &BlockId) -> Result<Timestamp> {
-		with_runtime!(self, at, ::runtime::Timestamp::get)
+		call(self, at, "timestamp", &[])
 	}

 	fn evaluate_block(&self, at: &BlockId, block: Block) -> Result<bool> {
-		use substrate_executor::error::ErrorKind as ExecErrorKind;
-		use codec::Encode;
-		use state_machine::ExecutionManager;
-		use client::CallExecutor;
-
-		let parent = at;
-		let res = self.state_at(&parent).map_err(Error::from).and_then(|state| {
-			let mut overlay = Default::default();
-			let execution_manager = || ExecutionManager::Both(|wasm_result, native_result| {
-				warn!("Consensus error between wasm and native runtime execution at block {:?}", at);
-				warn!("   While executing block {:?}", (block.header.number, block.header.hash()));
-				warn!("   Native result {:?}", native_result);
-				warn!("   Wasm result {:?}", wasm_result);
-				wasm_result
-			});
-			let (r, _) = self.executor().call_at_state(
-				&state,
-				&mut overlay,
-				"execute_block",
-				&block.encode(),
-				execution_manager()
-			)?;
-
-			Ok(r)
-		});
-
+		let encoded = block.encode();
+		let res: Result<()> = call(self, at, "execute_block", &encoded);
 		match res {
 			Ok(_) => Ok(true),
 			Err(err) => match err.kind() {
-				&ErrorKind::Executor(ExecErrorKind::Runtime) => Ok(false),
+				&ErrorKind::Execution(_) => Ok(false),
 				_ => Err(err)
 			}
 		}
 	}

 	fn index(&self, at: &BlockId, account: AccountId) -> Result<Index> {
-		with_runtime!(self, at, || ::runtime::System::account_nonce(account))
+		account.using_encoded(|encoded| {
+			call(self, at, "account_nonce", encoded)
+		})
 	}

 	fn lookup(&self, at: &BlockId, address: Address) -> Result<Option<AccountId>> {
-		with_runtime!(self, at, || <::runtime::Balances as AuxLookup>::lookup(address).ok())
+		address.using_encoded(|encoded| {
+			call(self, at, "lookup_address", encoded)
+		})
 	}

 	fn active_parachains(&self, at: &BlockId) -> Result<Vec<ParaId>> {
-		with_runtime!(self, at, ::runtime::Parachains::active_parachains)
+		call(self, at, "active_parachains", &[])
 	}

 	fn parachain_code(&self, at: &BlockId, parachain: ParaId) -> Result<Option<Vec<u8>>> {
-		with_runtime!(self, at, || ::runtime::Parachains::parachain_code(parachain))
+		parachain.using_encoded(|encoded| {
+			call(self, at, "parachain_code", encoded)
+		})
 	}

 	fn parachain_head(&self, at: &BlockId, parachain: ParaId) -> Result<Option<Vec<u8>>> {
-		with_runtime!(self, at, || ::runtime::Parachains::parachain_head(parachain))
+		parachain.using_encoded(|encoded| {
+			call(self, at, "parachain_head", encoded)
+		})
 	}

 	fn build_block(&self, at: &BlockId, inherent_data: InherentData) -> Result<Self::BlockBuilder> {
@@ -161,17 +165,9 @@ impl<B: LocalBackend<Block, KeccakHasher, RlpCodec>> PolkadotApi for Client<B, L
 	}

 	fn inherent_extrinsics(&self, at: &BlockId, inherent_data: InherentData) -> Result<Vec<UncheckedExtrinsic>> {
-		use codec::{Encode, Decode};
-
 		let runtime_version = self.runtime_version_at(at)?;
-
-		with_runtime!(self, at, || {
-			let extrinsics = ::runtime::inherent_extrinsics(inherent_data, runtime_version.spec_version);
-			extrinsics.into_iter()
-				.map(|x| x.encode()) // get encoded representation
-				.map(|x| Decode::decode(&mut &x[..])) // get byte-vec equivalent to extrinsic
-				.map(|x| x.expect("UncheckedExtrinsic has encoded representation equivalent to Vec<u8>; qed"))
-				.collect()
+		(inherent_data, runtime_version.spec_version).using_encoded(|encoded| {
+			call(self, at, "inherent_extrinsics", encoded)
 		})
 	}
 }

--- a/api/src/lib.rs
+++ b/api/src/lib.rs
@@ -60,6 +60,11 @@ error_chain! {
 			description("Unknown block")
 			display("Unknown block {}", b)
 		}
+		/// Execution error.
+		Execution(e: String) {
+			description("Execution error")
+			display("Execution error: {}", e)
+		}
 		/// Some other error.
 		// TODO: allow to be specified as associated type of PolkadotApi
 		Other(e: Box<::std::error::Error + Send>) {
@@ -67,16 +72,14 @@ error_chain! {
 			display("Other error: {}", e.description())
 		}
 	}
-
-	links {
-		Executor(substrate_executor::error::Error, substrate_executor::error::ErrorKind);
-	}
 }

 impl From<client::error::Error> for Error {
 	fn from(e: client::error::Error) -> Error {
 		match e {
 			client::error::Error(client::error::ErrorKind::UnknownBlock(b), _) => Error::from_kind(ErrorKind::UnknownBlock(b)),
+			client::error::Error(client::error::ErrorKind::Execution(e), _) =>
+				Error::from_kind(ErrorKind::Execution(format!("{}", e))),
 			other => Error::from_kind(ErrorKind::Other(Box::new(other) as Box<_>)),
 		}
 	}

--- a/demo/runtime/wasm/target/wasm32-unknown-unknown/release/demo_runtime.compact.wasm
+++ b/demo/runtime/wasm/target/wasm32-unknown-unknown/release/demo_runtime.compact.wasm
--- a/demo/runtime/wasm/target/wasm32-unknown-unknown/release/demo_runtime.wasm
+++ b/demo/runtime/wasm/target/wasm32-unknown-unknown/release/demo_runtime.wasm
--- a/polkadot/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.compact.wasm
+++ b/polkadot/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.compact.wasm
--- a/polkadot/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.wasm
+++ b/polkadot/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.wasm
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -275,7 +275,15 @@ pub mod api {
 		finalise_block => |()| super::Executive::finalise_block(),
 		inherent_extrinsics => |(inherent, spec_version)| super::inherent_extrinsics(inherent, spec_version),
 		validator_count => |()| super::Session::validator_count(),
-		validators => |()| super::Session::validators()
+		validators => |()| super::Session::validators(),
+		duty_roster => |()| super::Parachains::calculate_duty_roster(),
+		active_parachains => |()| super::Parachains::active_parachains(),
+		parachain_head => |id| super::Parachains::parachain_head(&id),
+		parachain_code => |id| super::Parachains::parachain_code(&id),
+		timestamp => |()| super::Timestamp::get(),
+		random_seed => |()| super::System::random_seed(),
+		account_nonce => |account| super::System::account_nonce(&account),
+		lookup_address => |address| super::Balances::lookup_address(address)
 	);
 }


--- a/runtime/wasm/Cargo.lock
+++ b/runtime/wasm/Cargo.lock
@@ -87,13 +87,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "ed25519"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=polkadot#f074c15cae617ed1734efda5308e4753d79d9006"
+source = "git+https://github.com/paritytech/substrate#e6bf0c7d2b23b57f2821b31a1951903b68b64d27"
 dependencies = [
 "base58 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
 "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "ring 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
 "untrusted 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

@@ -108,7 +108,7 @@ dependencies = [
 [[package]]
 name = "environmental"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=polkadot#f074c15cae617ed1734efda5308e4753d79d9006"
+source = "git+https://github.com/paritytech/substrate#e6bf0c7d2b23b57f2821b31a1951903b68b64d27"

 [[package]]
 name = "ethbloom"
@@ -391,11 +391,11 @@ version = "0.1.0"
 dependencies = [
 "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
 "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/substrate)",
 ]

 [[package]]
@@ -405,23 +405,23 @@ dependencies = [
 "integer-sqrt 0.1.0 (git+https://github.com/paritytech/integer-sqrt-rs.git)",
 "polkadot-primitives 0.1.0",
 "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "substrate-codec 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-balances 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-council 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-democracy 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-executive 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-session 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-staking 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-timestamp 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-version 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-balances 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-consensus 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-council 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-democracy 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-executive 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-io 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-session 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-staking 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-support 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-timestamp 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-version 0.1.0 (git+https://github.com/paritytech/substrate)",
 ]

 [[package]]
@@ -448,16 +448,16 @@ dependencies = [
 [[package]]
 name = "pwasm-alloc"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=polkadot#f074c15cae617ed1734efda5308e4753d79d9006"
+source = "git+https://github.com/paritytech/substrate#e6bf0c7d2b23b57f2821b31a1951903b68b64d27"
 dependencies = [
- "pwasm-libc 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
+ "pwasm-libc 0.1.0 (git+https://github.com/paritytech/substrate)",
 "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

 [[package]]
 name = "pwasm-libc"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=polkadot#f074c15cae617ed1734efda5308e4753d79d9006"
+source = "git+https://github.com/paritytech/substrate#e6bf0c7d2b23b57f2821b31a1951903b68b64d27"

 [[package]]
 name = "quote"
@@ -622,7 +622,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "substrate-codec"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=polkadot#f074c15cae617ed1734efda5308e4753d79d9006"
+source = "git+https://github.com/paritytech/substrate#e6bf0c7d2b23b57f2821b31a1951903b68b64d27"
 dependencies = [
 "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -630,7 +630,7 @@ dependencies = [
 [[package]]
 name = "substrate-codec-derive"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=polkadot#f074c15cae617ed1734efda5308e4753d79d9006"
+source = "git+https://github.com/paritytech/substrate#e6bf0c7d2b23b57f2821b31a1951903b68b64d27"
 dependencies = [
 "proc-macro2 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)",
 "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -640,9 +640,9 @@ dependencies = [
 [[package]]
 name = "substrate-keyring"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=polkadot#f074c15cae617ed1734efda5308e4753d79d9006"
+source = "git+https://github.com/paritytech/substrate#e6bf0c7d2b23b57f2821b31a1951903b68b64d27"
 dependencies = [
- "ed25519 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
+ "ed25519 0.1.0 (git+https://github.com/paritytech/substrate)",
 "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -650,7 +650,7 @@ dependencies = [
 [[package]]
 name = "substrate-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=polkadot#f074c15cae617ed1734efda5308e4753d79d9006"
+source = "git+https://github.com/paritytech/substrate#e6bf0c7d2b23b57f2821b31a1951903b68b64d27"
 dependencies = [
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@@ -664,9 +664,9 @@ dependencies = [
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- "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
- "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
+ "substrate-codec 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-codec-derive 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-runtime-std 0.1.0 (git+https://github.com/paritytech/substrate)",
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 "twox-hash 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -676,276 +676,272 @@ dependencies = [
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- "substrate-runtime-timestamp 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
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- "substrate-runtime-system 0.1.0 (git+https://github.com/paritytech/substrate?branch=polkadot)",
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