pallets: implement Default for GenesisConfig in no_std (#2624)

* pallets: implement Default for GenesisConfig in no_std

This change is follow-up of: https://github.com/paritytech/substrate/pull/14108

It is a step towards: https://github.com/paritytech/substrate/issues/13334

* ".git/.scripts/commands/fmt/fmt.sh"

* update lockfile for {"substrate", "polkadot"}

---------

Co-authored-by: command-bot <>

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

@@ -88,7 +88,7 @@ pub mod pallet {
 			Currency, EnsureOrigin, ExistenceRequirement::KeepAlive, ReservableCurrency,
 			ValidatorRegistration,
 		},
-		BoundedVec, PalletId,
+		BoundedVec, DefaultNoBound, PalletId,
 	};
 	use frame_system::{pallet_prelude::*, Config as SystemConfig};
 	use pallet_session::SessionManager;
@@ -203,28 +203,20 @@ pub mod pallet {
 	pub type CandidacyBond<T> = StorageValue<_, BalanceOf<T>, ValueQuery>;
 
 	#[pallet::genesis_config]
+	#[derive(DefaultNoBound)]
 	pub struct GenesisConfig<T: Config> {
 		pub invulnerables: Vec<T::AccountId>,
 		pub candidacy_bond: BalanceOf<T>,
 		pub desired_candidates: u32,
 	}
 
-	#[cfg(feature = "std")]
-	impl<T: Config> Default for GenesisConfig<T> {
-		fn default() -> Self {
-			Self {
-				invulnerables: Default::default(),
-				candidacy_bond: Default::default(),
-				desired_candidates: Default::default(),
-			}
-		}
-	}
-
 	#[pallet::genesis_build]
 	impl<T: Config> GenesisBuild<T> for GenesisConfig<T> {
 		fn build(&self) {
-			let duplicate_invulnerables =
-				self.invulnerables.iter().collect::<std::collections::BTreeSet<_>>();
+			let duplicate_invulnerables = self
+				.invulnerables
+				.iter()
+				.collect::<sp_std::collections::btree_set::BTreeSet<_>>();
 			assert!(
 				duplicate_invulnerables.len() == self.invulnerables.len(),
 				"duplicate invulnerables in genesis."