type t = [ `InboundGroupSession ] Ctypes.structure
val t : t F.typval initial_ratchet : (Megolm.t, t) F.fieldval latest_ratchet : (Megolm.t, t) F.fieldval signing_key : (ED25519PublicKey.t, t) F.fieldval signing_key_verified : (int, t) F.fieldval last_error : (ErrorCode.t, t) F.field