fix

pallets/elections/src/migrations/v1_to_v2.rs

@@ -8,6 +8,8 @@ use frame_support::{
 #[cfg(feature = "try-runtime")]
 use pallets_support::ensure_storage_version;
 use pallets_support::StorageMigration;
+#[cfg(feature = "try-runtime")]
+use sp_std::vec::Vec;
 
 use crate::{migrations::Validators, Config, EraValidators};
 

pallets/elections/src/migrations/v2_to_v3.rs

@@ -9,6 +9,8 @@ use frame_support::{
 use pallets_support::ensure_storage_version;
 use pallets_support::StorageMigration;
 use primitives::CommitteeSeats;
+#[cfg(feature = "try-runtime")]
+use sp_std::vec::Vec;
 
 use crate::{migrations::Validators, Config, EraValidators};
 

pallets/support/src/migration.rs

@@ -8,6 +8,8 @@ use frame_support::{
     pallet_prelude::{PalletInfoAccess, StorageVersion, Weight},
     traits::OnRuntimeUpgrade,
 };
+#[cfg(feature = "try-runtime")]
+use sp_std::vec::Vec;
 
 /// In order to run both pre- and post- checks around every migration, we entangle methods of
 /// `OnRuntimeUpgrade` into the desired flow and expose it with `migrate` method.