Mockup.Forgeval make_shell :
level:Stdlib.Int32.t ->
predecessor:Mavryk_crypto.Hashed.Block_hash.t ->
timestamp:Mavryk_base.Time.Protocol.t ->
fitness:Mavryk_base.Fitness.t ->
operations_hash:Mavryk_crypto.Hashed.Operation_list_list_hash.t ->
Mavryk_base.Block_header.shell_header