package tezos-protocol-alpha

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val must_exist : 
  Raw_context.t ->
  Destination_repr.t ->
  Raw_context.t Tezos_protocol_environment_alpha.Error_monad.tzresult
    Tezos_protocol_environment_alpha.Lwt.t

must_exist ctxt dest checks whether the given destination dest exists in the context ctxt. If the destination exists, a new context is returned with gas consumed for the lookup cost. If it does not exist, an error is returned.