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#[derive(RustcDecodable, Debug)] pub struct FcmResponse { pub message_id: Option<u64>, pub error: Option<String>, pub multicast_id: Option<i64>, pub success: Option<u64>, pub failure: Option<u64>, pub canonical_ids: Option<u64>, pub results: Option<Vec<MessageResult>> } #[derive(RustcDecodable, Debug)] pub struct MessageResult { pub message_id: Option<u64>, pub registration_id: Option<u64>, pub error: Option<String> } #[derive(PartialEq, Debug)] pub enum FcmError { Unauthorized, InvalidMessage(String), ServerError }