[frame] #[pallet::composite_enum] improved variant count handling + removed pallet_balances's MaxHolds config

bridges/snowbridge/parachain/pallets/inbound-queue/src/mock.rs

@@ -88,7 +88,6 @@ impl pallet_balances::Config for Test {
 	type MaxFreezes = ();
 	type RuntimeHoldReason = ();
 	type RuntimeFreezeReason = ();
-	type MaxHolds = ();
 }
 
 parameter_types! {

bridges/snowbridge/parachain/pallets/system/src/mock.rs

@@ -136,7 +136,6 @@ impl pallet_balances::Config for Test {
 	type MaxFreezes = ();
 	type RuntimeHoldReason = ();
 	type RuntimeFreezeReason = ();
-	type MaxHolds = ();
 }
 
 impl pallet_xcm_origin::Config for Test {

cumulus/pallets/collator-selection/src/mock.rs

@@ -95,7 +95,6 @@ impl pallet_balances::Config for Test {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/pallets/xcmp-queue/src/mock.rs

@@ -104,7 +104,6 @@ impl pallet_balances::Config for Test {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachain-template/runtime/src/lib.rs

@@ -337,7 +337,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/common/src/impls.rs

@@ -257,7 +257,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

cumulus/parachains/runtimes/assets/asset-hub-rococo/src/lib.rs

@@ -241,10 +241,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	// We allow each account to have holds on it from:
-	//   - `NftFractionalization`: 1
-	//   - `StateTrieMigration`: 1
-	type MaxHolds = ConstU32<2>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/assets/asset-hub-westend/src/lib.rs

@@ -201,9 +201,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	// We allow each account to have holds on it from:
-	//   - `NftFractionalization`: 1
-	type MaxHolds = ConstU32<1>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/lib.rs

@@ -306,7 +306,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-westend/src/lib.rs

@@ -280,7 +280,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/collectives/collectives-westend/src/lib.rs

@@ -211,7 +211,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<1>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/contracts/contracts-rococo/src/lib.rs

@@ -217,7 +217,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<1>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/coretime/coretime-rococo/src/lib.rs

@@ -228,7 +228,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/coretime/coretime-westend/src/lib.rs

@@ -219,7 +219,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/people/people-rococo/src/lib.rs

@@ -210,7 +210,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/people/people-westend/src/lib.rs

@@ -210,7 +210,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/testing/penpal/src/lib.rs

@@ -404,7 +404,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/parachains/runtimes/testing/rococo-parachain/src/lib.rs

@@ -258,7 +258,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

cumulus/test/runtime/src/lib.rs

@@ -236,7 +236,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/runtime/common/src/assigned_slots/mod.rs

@@ -724,7 +724,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

polkadot/runtime/common/src/auctions.rs

@@ -752,7 +752,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

polkadot/runtime/common/src/claims.rs

@@ -782,7 +782,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

polkadot/runtime/common/src/crowdloan/mod.rs

@@ -944,7 +944,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

polkadot/runtime/common/src/impls.rs

@@ -304,7 +304,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

polkadot/runtime/common/src/integration_tests.rs

@@ -189,7 +189,6 @@ impl pallet_balances::Config for Test {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/runtime/common/src/paras_registrar/mod.rs

@@ -801,7 +801,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

polkadot/runtime/common/src/purchase.rs

@@ -556,7 +556,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

polkadot/runtime/common/src/slots/mod.rs

@@ -574,7 +574,6 @@ mod tests {
 		type RuntimeHoldReason = RuntimeHoldReason;
 		type RuntimeFreezeReason = RuntimeFreezeReason;
 		type FreezeIdentifier = ();
-		type MaxHolds = ConstU32<1>;
 		type MaxFreezes = ConstU32<1>;
 	}
 

polkadot/runtime/parachains/src/mock.rs

@@ -147,7 +147,6 @@ impl pallet_balances::Config for Test {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/runtime/rococo/src/lib.rs

@@ -311,10 +311,9 @@ impl pallet_balances::Config for Runtime {
 	type ReserveIdentifier = [u8; 8];
 	type WeightInfo = weights::pallet_balances::WeightInfo<Runtime>;
 	type FreezeIdentifier = ();
-	type MaxFreezes = ConstU32<1>;
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
-	type MaxHolds = ConstU32<3>;
+	type MaxFreezes = ConstU32<1>;
 }
 
 parameter_types! {
@@ -1167,7 +1166,6 @@ impl pallet_balances::Config<NisCounterpartInstance> for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<3>;
 	type MaxFreezes = ConstU32<1>;
 }
 

polkadot/runtime/test-runtime/src/lib.rs

@@ -221,7 +221,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/runtime/westend/src/lib.rs

@@ -303,8 +303,8 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = RuntimeFreezeReason;
+
 	type MaxFreezes = ConstU32<1>;
-	type MaxHolds = ConstU32<1>;
 }
 
 parameter_types! {

polkadot/xcm/pallet-xcm/src/mock.rs

@@ -289,7 +289,6 @@ impl pallet_balances::Config for Test {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/xcm/xcm-builder/src/tests/pay/mock.rs

@@ -77,7 +77,6 @@ impl pallet_balances::Config for Test {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/xcm/xcm-builder/tests/mock/mod.rs

@@ -124,7 +124,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/xcm/xcm-simulator/example/src/parachain.rs

@@ -108,7 +108,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/xcm/xcm-simulator/example/src/relay_chain.rs

@@ -95,7 +95,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/xcm/xcm-simulator/fuzzer/src/parachain.rs

@@ -99,7 +99,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

polkadot/xcm/xcm-simulator/fuzzer/src/relay_chain.rs

@@ -96,7 +96,6 @@ impl pallet_balances::Config for Runtime {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ConstU32<0>;
 	type MaxFreezes = ConstU32<0>;
 }
 

prdoc/pr_2657.prdoc

@@ -0,0 +1,28 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: "[frame] `#[pallet::composite_enum]` improved variant count handling + removed `pallet_balances`'s `MaxHolds` config"
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      The implementation of `VariantCount` trait for the result composite enums
+      like `RuntimeHoldReason` and `RuntimeFreezeReason` was fixed
+      and is now calculated as the sum of the `VariantCount::VARIANT_COUNT` of all corresponding `#[pallet::composite_enum]`s.
+      The Balances pallet's `Config` item `type MaxHolds` was removed
+      and `type Holds` are now bounded to the composite enum `RuntimeHoldReason` variant count,
+      so the runtime does not need to consider setting correct value for `MaxHolds`.
+
+      The implementation of the `VariantCount` trait for resulting composite enums,
+      such as `RuntimeHoldReason` and `RuntimeFreezeReason`, has been fixed.
+      It is now calculated as the sum of `VariantCount::VARIANT_COUNT` for all corresponding `#[pallet::composite_enum]`.
+      The `Balances` pallet's `Config` item `type MaxHolds` has been removed,
+      and `type Holds` is now bound to the variant count of the composite enum `RuntimeHoldReason`.
+      Consequently, the runtime does not need to consider setting the correct value for `MaxHolds`.
+
+      notes:
+      - Remove `type MaxHolds` from the `impl pallet_balances::Config for Runtime` in the runtime.
+      - When holds are expected to be used, ensure that `type RuntimeHoldReason = RuntimeHoldReason` is set for `impl pallet_balances::Config for Runtime`.
+
+crates:
+  - name: pallet-balances

substrate/bin/node-template/runtime/src/lib.rs

@@ -228,7 +228,6 @@ impl pallet_balances::Config for Runtime {
 	type MaxFreezes = ();
 	type RuntimeHoldReason = ();
 	type RuntimeFreezeReason = ();
-	type MaxHolds = ();
 }
 
 parameter_types! {

substrate/bin/node/runtime/src/lib.rs

@@ -533,7 +533,6 @@ impl pallet_balances::Config for Runtime {
 	type WeightInfo = pallet_balances::weights::SubstrateWeight<Runtime>;
 	type FreezeIdentifier = RuntimeFreezeReason;
 	type MaxFreezes = ConstU32<1>;
-	type MaxHolds = ConstU32<7>;
 }
 
 parameter_types! {

substrate/frame/alliance/src/mock.rs

@@ -72,7 +72,6 @@ impl pallet_balances::Config for Test {
 	type MaxFreezes = ();
 	type RuntimeHoldReason = ();
 	type RuntimeFreezeReason = ();
-	type MaxHolds = ();
 }
 
 const MOTION_DURATION_IN_BLOCKS: BlockNumber = 3;

substrate/frame/asset-conversion/src/mock.rs

@@ -95,7 +95,6 @@ impl pallet_balances::Config for Test {
 	type MaxFreezes = ();
 	type RuntimeHoldReason = ();
 	type RuntimeFreezeReason = ();
-	type MaxHolds = ();
 }
 
 impl pallet_assets::Config<Instance1> for Test {

substrate/frame/asset-rate/src/mock.rs

@@ -79,7 +79,6 @@ impl pallet_balances::Config for Test {
 	type RuntimeHoldReason = RuntimeHoldReason;
 	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type FreezeIdentifier = ();
-	type MaxHolds = ();
 	type MaxFreezes = ();
 }