Tezos_base.User_activatedSourceUser activated upgrades: at given level, switch to given protocol.
type protocol_overrides =
(Tezos_crypto.Hashed.Protocol_hash.t * Tezos_crypto.Hashed.Protocol_hash.t)
listUser activated protocol overrides.
An override (a, b) denotes that if a is to be activated at the end of the promotion phase, b shall be activated instead.