Deprecate V1 Weights (#13699)

* Remove deprecated pallet calls

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Deprecate old weight

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update Runtime API

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Fix tests

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Delete shitty code

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Fix doctest

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update frame/alliance/src/lib.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Add doc

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* contracts: Use u64 as old weight type

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update frame/contracts/src/lib.rs

Co-authored-by: Alexander Theißen <alex.theissen@me.com>

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Koute <koute@users.noreply.github.com>
Co-authored-by: Alexander Theißen <alex.theissen@me.com>
Co-authored-by: parity-processbot <>

substrate/frame/alliance/src/lib.rs

@@ -114,7 +114,7 @@ use frame_support::{
 		ChangeMembers, Currency, Get, InitializeMembers, IsSubType, OnUnbalanced,
 		ReservableCurrency,
 	},
-	weights::{OldWeight, Weight},
+	weights::Weight,
 };
 use pallet_identity::IdentityField;
 
@@ -539,36 +539,7 @@ pub mod pallet {
 			Ok(())
 		}
 
-		/// Close a vote that is either approved, disapproved, or whose voting period has ended.
-		///
-		/// Must be called by a Fellow.
-		#[pallet::call_index(2)]
-		#[pallet::weight({
-			let b = *length_bound;
-			let m = T::MaxFellows::get();
-			let p1 = *proposal_weight_bound;
-			let p2 = T::MaxProposals::get();
-			T::WeightInfo::close_early_approved(b, m, p2)
-				.max(T::WeightInfo::close_early_disapproved(m, p2))
-				.max(T::WeightInfo::close_approved(b, m, p2))
-				.max(T::WeightInfo::close_disapproved(m, p2))
-				.saturating_add(p1.into())
-		})]
-		#[allow(deprecated)]
-		#[deprecated(note = "1D weight is used in this extrinsic, please migrate to use `close`")]
-		pub fn close_old_weight(
-			origin: OriginFor<T>,
-			proposal_hash: T::Hash,
-			#[pallet::compact] index: ProposalIndex,
-			#[pallet::compact] proposal_weight_bound: OldWeight,
-			#[pallet::compact] length_bound: u32,
-		) -> DispatchResultWithPostInfo {
-			let proposal_weight_bound: Weight = proposal_weight_bound.into();
-			let who = ensure_signed(origin)?;
-			ensure!(Self::has_voting_rights(&who), Error::<T, I>::NoVotingRights);
-
-			Self::do_close(proposal_hash, index, proposal_weight_bound, length_bound)
-		}
+		// Index 2 was `close_old_weight`; it was removed due to weights v1 deprecation.
 
 		/// Initialize the Alliance, onboard fellows and allies.
 		///

substrate/frame/collective/src/lib.rs

@@ -57,7 +57,7 @@ use frame_support::{
 	traits::{
 		Backing, ChangeMembers, EnsureOrigin, Get, GetBacking, InitializeMembers, StorageVersion,
 	},
-	weights::{OldWeight, Weight},
+	weights::Weight,
 };
 
 #[cfg(test)]
@@ -557,59 +557,7 @@ pub mod pallet {
 			}
 		}
 
-		/// Close a vote that is either approved, disapproved or whose voting period has ended.
-		///
-		/// May be called by any signed account in order to finish voting and close the proposal.
-		///
-		/// If called before the end of the voting period it will only close the vote if it is
-		/// has enough votes to be approved or disapproved.
-		///
-		/// If called after the end of the voting period abstentions are counted as rejections
-		/// unless there is a prime member set and the prime member cast an approval.
-		///
-		/// If the close operation completes successfully with disapproval, the transaction fee will
-		/// be waived. Otherwise execution of the approved operation will be charged to the caller.
-		///
-		/// + `proposal_weight_bound`: The maximum amount of weight consumed by executing the closed
-		/// proposal.
-		/// + `length_bound`: The upper bound for the length of the proposal in storage. Checked via
-		/// `storage::read` so it is `size_of::<u32>() == 4` larger than the pure length.
-		///
-		/// ## Complexity
-		/// - `O(B + M + P1 + P2)` where:
-		///   - `B` is `proposal` size in bytes (length-fee-bounded)
-		///   - `M` is members-count (code- and governance-bounded)
-		///   - `P1` is the complexity of `proposal` preimage.
-		///   - `P2` is proposal-count (code-bounded)
-		#[pallet::call_index(4)]
-		#[pallet::weight((
-			{
-				let b = *length_bound;
-				let m = T::MaxMembers::get();
-				let p1 = *proposal_weight_bound;
-				let p2 = T::MaxProposals::get();
-				T::WeightInfo::close_early_approved(b, m, p2)
-					.max(T::WeightInfo::close_early_disapproved(m, p2))
-					.max(T::WeightInfo::close_approved(b, m, p2))
-					.max(T::WeightInfo::close_disapproved(m, p2))
-					.saturating_add(p1.into())
-			},
-			DispatchClass::Operational
-		))]
-		#[allow(deprecated)]
-		#[deprecated(note = "1D weight is used in this extrinsic, please migrate to `close`")]
-		pub fn close_old_weight(
-			origin: OriginFor<T>,
-			proposal_hash: T::Hash,
-			#[pallet::compact] index: ProposalIndex,
-			#[pallet::compact] proposal_weight_bound: OldWeight,
-			#[pallet::compact] length_bound: u32,
-		) -> DispatchResultWithPostInfo {
-			let proposal_weight_bound: Weight = proposal_weight_bound.into();
-			let _ = ensure_signed(origin)?;
-
-			Self::do_close(proposal_hash, index, proposal_weight_bound, length_bound)
-		}
+		// Index 4 was `close_old_weight`; it was removed due to weights v1 deprecation.
 
 		/// Disapprove a proposal, close, and remove it from the system, regardless of its current
 		/// state.

substrate/frame/contracts/src/lib.rs

@@ -115,7 +115,7 @@ use frame_support::{
 		tokens::fungible::Inspect, ConstU32, Contains, Currency, Get, Randomness,
 		ReservableCurrency, Time,
 	},
-	weights::{OldWeight, Weight},
+	weights::Weight,
 	BoundedVec, WeakBoundedVec,
 };
 use frame_system::Pallet as System;
@@ -150,6 +150,12 @@ type RelaxedCodeVec<T> = WeakBoundedVec<u8, <T as Config>::MaxCodeLen>;
 type AccountIdLookupOf<T> = <<T as frame_system::Config>::Lookup as StaticLookup>::Source;
 type DebugBufferVec<T> = BoundedVec<u8, <T as Config>::MaxDebugBufferLen>;
 
+/// The old weight type.
+///
+/// This is a copy of the [`frame_support::weights::OldWeight`] type since the contracts pallet
+/// needs to support it indefinitely.
+type OldWeight = u64;
+
 /// Used as a sentinel value when reading and writing contract memory.
 ///
 /// It is usually used to signal `None` to a contract when only a primitive is allowed
@@ -1281,7 +1287,7 @@ impl<T: Config> Pallet<T> {
 	/// Used by backwards compatible extrinsics. We cannot just set the proof_size weight limit to
 	/// zero or an old `Call` will just fail with OutOfGas.
 	fn compat_weight_limit(gas_limit: OldWeight) -> Weight {
-		Weight::from_parts(gas_limit.0, u64::from(T::MaxCodeLen::get()) * 2)
+		Weight::from_parts(gas_limit, u64::from(T::MaxCodeLen::get()) * 2)
 	}
 }
 

substrate/frame/contracts/src/wasm/mod.rs

@@ -370,13 +370,11 @@ mod tests {
 		gas::GasMeter,
 		storage::WriteOutcome,
 		tests::{RuntimeCall, Test, ALICE, BOB},
-		BalanceOf, CodeHash, Error, Pallet as Contracts,
+		BalanceOf, CodeHash, Error, OldWeight, Pallet as Contracts,
 	};
 	use assert_matches::assert_matches;
 	use frame_support::{
-		assert_err, assert_ok,
-		dispatch::DispatchResultWithPostInfo,
-		weights::{OldWeight, Weight},
+		assert_err, assert_ok, dispatch::DispatchResultWithPostInfo, weights::Weight,
 	};
 	use pallet_contracts_primitives::{ExecReturnValue, ReturnFlags};
 	use pretty_assertions::assert_eq;
@@ -1632,13 +1630,24 @@ mod tests {
 
 		let output = execute(CODE_GAS_LEFT, vec![], &mut ext).unwrap();
 
-		let OldWeight(gas_left) = OldWeight::decode(&mut &*output.data).unwrap();
+		let gas_left = OldWeight::decode(&mut &*output.data).unwrap();
 		let actual_left = ext.gas_meter.gas_left();
 		// TODO: account for proof size weight
 		assert!(gas_left < gas_limit.ref_time(), "gas_left must be less than initial");
 		assert!(gas_left > actual_left.ref_time(), "gas_left must be greater than final");
 	}
 
+	/// Test that [`frame_support::weights::OldWeight`] en/decodes the same as our
+	/// [`crate::OldWeight`].
+	#[test]
+	fn old_weight_decode() {
+		#![allow(deprecated)]
+		let sp = frame_support::weights::OldWeight(42).encode();
+		let our = crate::OldWeight::decode(&mut &*sp).unwrap();
+
+		assert_eq!(our, 42);
+	}
+
 	const CODE_VALUE_TRANSFERRED: &str = r#"
 (module
 	(import "seal0" "seal_value_transferred" (func $seal_value_transferred (param i32 i32)))

substrate/frame/support/src/dispatch.rs

@@ -550,27 +550,6 @@ impl<T> ClassifyDispatch<T> for (Weight, DispatchClass, Pays) {
 
 // TODO: Eventually remove these
 
-impl From<Option<u64>> for PostDispatchInfo {
-	fn from(maybe_actual_computation: Option<u64>) -> Self {
-		let actual_weight = match maybe_actual_computation {
-			Some(actual_computation) => Some(Weight::from_parts(actual_computation, 0)),
-			None => None,
-		};
-		Self { actual_weight, pays_fee: Default::default() }
-	}
-}
-
-impl From<(Option<u64>, Pays)> for PostDispatchInfo {
-	fn from(post_weight_info: (Option<u64>, Pays)) -> Self {
-		let (maybe_actual_time, pays_fee) = post_weight_info;
-		let actual_weight = match maybe_actual_time {
-			Some(actual_time) => Some(Weight::from_parts(actual_time, 0)),
-			None => None,
-		};
-		Self { actual_weight, pays_fee }
-	}
-}
-
 impl<T> ClassifyDispatch<T> for u64 {
 	fn classify_dispatch(&self, _: T) -> DispatchClass {
 		DispatchClass::Normal
@@ -730,7 +709,7 @@ impl<T> PaysFee<T> for (u64, Pays) {
 /// ```
 /// # #[macro_use]
 /// # extern crate frame_support;
-/// # use frame_support::{weights::Weight, dispatch::{DispatchResultWithPostInfo, WithPostDispatchInfo}};
+/// # use frame_support::{weights::Weight, dispatch::{DispatchResultWithPostInfo, WithPostDispatchInfo, PostDispatchInfo}};
 /// # use frame_system::{Config, ensure_signed};
 /// decl_module! {
 /// 	pub struct Module<T: Config> for enum Call where origin: T::RuntimeOrigin {
@@ -744,7 +723,7 @@ impl<T> PaysFee<T> for (u64, Pays) {
 /// 				return Ok(None::<Weight>.into());
 /// 			}
 /// 			// expensive calculation not executed: use only a portion of the weight
-/// 			Ok(Some(100_000).into())
+/// 			Ok(PostDispatchInfo { actual_weight: Some(Weight::from_parts(100_000, 0)), ..Default::default() })
 /// 		}
 /// 	}
 /// }
@@ -3214,7 +3193,7 @@ mod tests {
 			OnInitialize, OnRuntimeUpgrade, PalletInfo,
 		},
 	};
-	use sp_weights::RuntimeDbWeight;
+	use sp_weights::{RuntimeDbWeight, Weight};
 
 	pub trait Config: system::Config + Sized
 	where
@@ -3535,13 +3514,24 @@ mod tests {
 	fn test_new_call_variant() {
 		Call::<TraitImpl>::new_call_variant_aux_0();
 	}
+
+	pub fn from_actual_ref_time(ref_time: Option<u64>) -> PostDispatchInfo {
+		PostDispatchInfo {
+			actual_weight: ref_time.map(|t| Weight::from_all(t)),
+			pays_fee: Default::default(),
+		}
+	}
+
+	pub fn from_post_weight_info(ref_time: Option<u64>, pays_fee: Pays) -> PostDispatchInfo {
+		PostDispatchInfo { actual_weight: ref_time.map(|t| Weight::from_all(t)), pays_fee }
+	}
 }
 
 #[cfg(test)]
 // Do not complain about unused `dispatch` and `dispatch_aux`.
 #[allow(dead_code)]
 mod weight_tests {
-	use super::*;
+	use super::{tests::*, *};
 	use sp_core::{parameter_types, Get};
 	use sp_weights::RuntimeDbWeight;
 
@@ -3655,9 +3645,12 @@ mod weight_tests {
 	#[test]
 	fn extract_actual_weight_works() {
 		let pre = DispatchInfo { weight: Weight::from_parts(1000, 0), ..Default::default() };
-		assert_eq!(extract_actual_weight(&Ok(Some(7).into()), &pre), Weight::from_parts(7, 0));
 		assert_eq!(
-			extract_actual_weight(&Ok(Some(1000).into()), &pre),
+			extract_actual_weight(&Ok(from_actual_ref_time(Some(7))), &pre),
+			Weight::from_parts(7, 0)
+		);
+		assert_eq!(
+			extract_actual_weight(&Ok(from_actual_ref_time(Some(1000))), &pre),
 			Weight::from_parts(1000, 0)
 		);
 		assert_eq!(
@@ -3673,7 +3666,7 @@ mod weight_tests {
 	fn extract_actual_weight_caps_at_pre_weight() {
 		let pre = DispatchInfo { weight: Weight::from_parts(1000, 0), ..Default::default() };
 		assert_eq!(
-			extract_actual_weight(&Ok(Some(1250).into()), &pre),
+			extract_actual_weight(&Ok(from_actual_ref_time(Some(1250))), &pre),
 			Weight::from_parts(1000, 0)
 		);
 		assert_eq!(
@@ -3688,10 +3681,19 @@ mod weight_tests {
 	#[test]
 	fn extract_actual_pays_fee_works() {
 		let pre = DispatchInfo { weight: Weight::from_parts(1000, 0), ..Default::default() };
-		assert_eq!(extract_actual_pays_fee(&Ok(Some(7).into()), &pre), Pays::Yes);
-		assert_eq!(extract_actual_pays_fee(&Ok(Some(1000).into()), &pre), Pays::Yes);
-		assert_eq!(extract_actual_pays_fee(&Ok((Some(1000), Pays::Yes).into()), &pre), Pays::Yes);
-		assert_eq!(extract_actual_pays_fee(&Ok((Some(1000), Pays::No).into()), &pre), Pays::No);
+		assert_eq!(extract_actual_pays_fee(&Ok(from_actual_ref_time(Some(7))), &pre), Pays::Yes);
+		assert_eq!(
+			extract_actual_pays_fee(&Ok(from_actual_ref_time(Some(1000)).into()), &pre),
+			Pays::Yes
+		);
+		assert_eq!(
+			extract_actual_pays_fee(&Ok(from_post_weight_info(Some(1000), Pays::Yes)), &pre),
+			Pays::Yes
+		);
+		assert_eq!(
+			extract_actual_pays_fee(&Ok(from_post_weight_info(Some(1000), Pays::No)), &pre),
+			Pays::No
+		);
 		assert_eq!(
 			extract_actual_pays_fee(
 				&Err(DispatchError::BadOrigin.with_weight(Weight::from_parts(9, 0))),
@@ -3715,9 +3717,12 @@ mod weight_tests {
 			pays_fee: Pays::No,
 			..Default::default()
 		};
-		assert_eq!(extract_actual_pays_fee(&Ok(Some(7).into()), &pre), Pays::No);
-		assert_eq!(extract_actual_pays_fee(&Ok(Some(1000).into()), &pre), Pays::No);
-		assert_eq!(extract_actual_pays_fee(&Ok((Some(1000), Pays::Yes).into()), &pre), Pays::No);
+		assert_eq!(extract_actual_pays_fee(&Ok(from_actual_ref_time(Some(7))), &pre), Pays::No);
+		assert_eq!(extract_actual_pays_fee(&Ok(from_actual_ref_time(Some(1000))), &pre), Pays::No);
+		assert_eq!(
+			extract_actual_pays_fee(&Ok(from_post_weight_info(Some(1000), Pays::Yes)), &pre),
+			Pays::No
+		);
 	}
 }
 

substrate/frame/system/src/tests.rs

@@ -236,17 +236,23 @@ fn deposit_event_uses_actual_weight_and_pays_fee() {
 			.get(DispatchClass::Normal)
 			.base_extrinsic;
 		let pre_info = DispatchInfo { weight: Weight::from_parts(1000, 0), ..Default::default() };
-		System::note_applied_extrinsic(&Ok(Some(300).into()), pre_info);
-		System::note_applied_extrinsic(&Ok(Some(1000).into()), pre_info);
+		System::note_applied_extrinsic(&Ok(from_actual_ref_time(Some(300))), pre_info);
+		System::note_applied_extrinsic(&Ok(from_actual_ref_time(Some(1000))), pre_info);
 		System::note_applied_extrinsic(
 			// values over the pre info should be capped at pre dispatch value
-			&Ok(Some(1200).into()),
+			&Ok(from_actual_ref_time(Some(1200))),
+			pre_info,
+		);
+		System::note_applied_extrinsic(
+			&Ok(from_post_weight_info(Some(2_500_000), Pays::Yes)),
 			pre_info,
 		);
-		System::note_applied_extrinsic(&Ok((Some(2_500_000), Pays::Yes).into()), pre_info);
 		System::note_applied_extrinsic(&Ok(Pays::No.into()), pre_info);
-		System::note_applied_extrinsic(&Ok((Some(2_500_000), Pays::No).into()), pre_info);
-		System::note_applied_extrinsic(&Ok((Some(500), Pays::No).into()), pre_info);
+		System::note_applied_extrinsic(
+			&Ok(from_post_weight_info(Some(2_500_000), Pays::No)),
+			pre_info,
+		);
+		System::note_applied_extrinsic(&Ok(from_post_weight_info(Some(500), Pays::No)), pre_info);
 		System::note_applied_extrinsic(
 			&Err(DispatchError::BadOrigin.with_weight(Weight::from_parts(999, 0))),
 			pre_info,
@@ -289,7 +295,7 @@ fn deposit_event_uses_actual_weight_and_pays_fee() {
 			class: DispatchClass::Operational,
 			..Default::default()
 		};
-		System::note_applied_extrinsic(&Ok(Some(300).into()), pre_info);
+		System::note_applied_extrinsic(&Ok(from_actual_ref_time(Some(300))), pre_info);
 
 		let got = System::events();
 		let want = vec![
@@ -691,3 +697,14 @@ fn ensure_signed_stuff_works() {
 		assert_ok!(EnsureSignedBy::<Members, _>::try_origin(successful_origin));
 	}
 }
+
+pub fn from_actual_ref_time(ref_time: Option<u64>) -> PostDispatchInfo {
+	PostDispatchInfo {
+		actual_weight: ref_time.map(|t| Weight::from_all(t)),
+		pays_fee: Default::default(),
+	}
+}
+
+pub fn from_post_weight_info(ref_time: Option<u64>, pays_fee: Pays) -> PostDispatchInfo {
+	PostDispatchInfo { actual_weight: ref_time.map(|t| Weight::from_all(t)), pays_fee }
+}

substrate/frame/transaction-payment/rpc/runtime-api/src/lib.rs

@@ -25,12 +25,10 @@ use sp_runtime::traits::MaybeDisplay;
 pub use pallet_transaction_payment::{FeeDetails, InclusionFee, RuntimeDispatchInfo};
 
 sp_api::decl_runtime_apis! {
-	#[api_version(3)]
+	#[api_version(4)]
 	pub trait TransactionPaymentApi<Balance> where
 		Balance: Codec + MaybeDisplay,
 	{
-		#[changed_in(2)]
-		fn query_info(uxt: Block::Extrinsic, len: u32) -> RuntimeDispatchInfo<Balance, sp_weights::OldWeight>;
 		fn query_info(uxt: Block::Extrinsic, len: u32) -> RuntimeDispatchInfo<Balance>;
 		fn query_fee_details(uxt: Block::Extrinsic, len: u32) -> FeeDetails<Balance>;
 		fn query_weight_to_fee(weight: sp_weights::Weight) -> Balance;

substrate/frame/transaction-payment/rpc/src/lib.rs

@@ -26,7 +26,7 @@ use jsonrpsee::{
 	types::error::{CallError, ErrorCode, ErrorObject},
 };
 use pallet_transaction_payment_rpc_runtime_api::{FeeDetails, InclusionFee, RuntimeDispatchInfo};
-use sp_api::{ApiExt, ProvideRuntimeApi};
+use sp_api::ProvideRuntimeApi;
 use sp_blockchain::HeaderBackend;
 use sp_core::Bytes;
 use sp_rpc::number::NumberOrHex;
@@ -81,7 +81,7 @@ impl From<Error> for i32 {
 impl<C, Block, Balance>
 	TransactionPaymentApiServer<
 		<Block as BlockT>::Hash,
-		RuntimeDispatchInfo<Balance, sp_weights::OldWeight>,
+		RuntimeDispatchInfo<Balance, sp_weights::Weight>,
 	> for TransactionPayment<C, Block>
 where
 	Block: BlockT,
@@ -93,7 +93,7 @@ where
 		&self,
 		encoded_xt: Bytes,
 		at: Option<Block::Hash>,
-	) -> RpcResult<RuntimeDispatchInfo<Balance, sp_weights::OldWeight>> {
+	) -> RpcResult<RuntimeDispatchInfo<Balance, sp_weights::Weight>> {
 		let api = self.client.runtime_api();
 		let at_hash = at.unwrap_or_else(|| self.client.info().best_hash);
 
@@ -115,32 +115,15 @@ where
 			))
 		}
 
-		let api_version = api
-			.api_version::<dyn TransactionPaymentRuntimeApi<Block, Balance>>(at_hash)
-			.map_err(|e| map_err(e, "Failed to get transaction payment runtime api version"))?
-			.ok_or_else(|| {
-				CallError::Custom(ErrorObject::owned(
-					Error::RuntimeError.into(),
-					"Transaction payment runtime api wasn't found in the runtime",
-					None::<String>,
-				))
-			})?;
+		let res = api
+			.query_info(at_hash, uxt, encoded_len)
+			.map_err(|e| map_err(e, "Unable to query dispatch info."))?;
 
-		if api_version < 2 {
-			#[allow(deprecated)]
-			api.query_info_before_version_2(at_hash, uxt, encoded_len)
-				.map_err(|e| map_err(e, "Unable to query dispatch info.").into())
-		} else {
-			let res = api
-				.query_info(at_hash, uxt, encoded_len)
-				.map_err(|e| map_err(e, "Unable to query dispatch info."))?;
-
-			Ok(RuntimeDispatchInfo {
-				weight: sp_weights::OldWeight(res.weight.ref_time()),
-				class: res.class,
-				partial_fee: res.partial_fee,
-			})
-		}
+		Ok(RuntimeDispatchInfo {
+			weight: res.weight,
+			class: res.class,
+			partial_fee: res.partial_fee,
+		})
 	}
 
 	fn query_fee_details(

substrate/primitives/weights/src/lib.rs

@@ -18,6 +18,9 @@
 //! # Primitives for transaction weighting.
 
 #![cfg_attr(not(feature = "std"), no_std)]
+// TODO remove once `OldWeight` is gone. I dont know why this is needed, maybe by one of the macros
+// of `OldWeight`.
+#![allow(deprecated)]
 
 extern crate self as sp_weights;
 
@@ -68,6 +71,7 @@ pub mod constants {
 )]
 #[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "std", serde(transparent))]
+#[deprecated(note = "Will be removed soon; use `Weight` instead.")]
 pub struct OldWeight(pub u64);
 
 /// The weight of database operations that the runtime can invoke.

substrate/primitives/weights/src/weight_v2.rs

@@ -35,12 +35,6 @@ pub struct Weight {
 	proof_size: u64,
 }
 
-impl From<OldWeight> for Weight {
-	fn from(old: OldWeight) -> Self {
-		Weight::from_parts(old.0, 0)
-	}
-}
-
 impl Weight {
 	/// Set the reference time part of the weight.
 	pub const fn set_ref_time(mut self, c: u64) -> Self {
@@ -74,6 +68,7 @@ impl Weight {
 		&mut self.proof_size
 	}
 
+	/// The maximal weight in all dimensions.
 	pub const MAX: Self = Self { ref_time: u64::MAX, proof_size: u64::MAX };
 
 	/// Get the conservative min of `self` and `other` weight.