Type Alias MigrateV3ToV4 

pub type MigrateV3ToV4<T> = VersionedMigration<3, 4, UncheckedMigrateV3ToV4<T>, Pallet<T>, <T as Config>::DbWeight>;

VersionedMigration, that is performed only when the on-chain version is 3.

Aliased Type

pub struct MigrateV3ToV4<T> { /* private fields */ }