Contracts: Ensure latest migration match pallet_version (#14676)

* Add version check

* fix format

* simplify

* restructure imports

* add version check

* Fix benchmarking

* Rename migrations -> BenchMigrations

* doc

* add more docs

* fix format string

* Update frame/contracts/build.rs

* fix

* add cargo:rerun-if-changed

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Co-authored-by: parity-processbot <>

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

@@ -55,8 +55,6 @@ use frame_system::{
 pub use node_primitives::{AccountId, Signature};
 use node_primitives::{AccountIndex, Balance, BlockNumber, Hash, Moment, Nonce};
 use pallet_asset_conversion::{NativeOrAssetId, NativeOrAssetIdConverter};
-#[cfg(feature = "runtime-benchmarks")]
-use pallet_contracts::NoopMigration;
 use pallet_election_provider_multi_phase::SolutionAccuracyOf;
 use pallet_im_online::sr25519::AuthorityId as ImOnlineId;
 use pallet_nfts::PalletFeatures;
@@ -1257,7 +1255,7 @@ impl pallet_contracts::Config for Runtime {
 	#[cfg(not(feature = "runtime-benchmarks"))]
 	type Migrations = ();
 	#[cfg(feature = "runtime-benchmarks")]
-	type Migrations = (NoopMigration<1>, NoopMigration<2>);
+	type Migrations = pallet_contracts::migration::codegen::BenchMigrations;
 	type MaxDelegateDependencies = ConstU32<32>;
 	type CodeHashLockupDepositPercent = CodeHashLockupDepositPercent;
 }