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error_chain! {
    foreign_links {
        Utf8(::std::str::Utf8Error) #[doc = "utf8 error, slack responses should be valid utf8"];
        Serialize(::serde_json::error::Error) #[doc = "`serde_json::error::Error`"];
        FromHex(::hexx::FromHexError) #[doc = "`rustc_serialize::hex::FromHexError`"];
        Reqwest(::reqwest::Error) #[doc = "`reqwest::Error`"];
        Url(::reqwest::UrlError) #[doc = "`reqwest::UrlError`"];
        Io(::std::io::Error) #[doc = "`std::io::Error`"];
    }

    errors {
        /// slack service error
        Slack(err: String) {
            description("slack service error")
            display("slack service error: {}", err)
        }
        /// `HexColor` parsing error
        HexColor(err: String) {
            description("hex color parsing error")
            display("hex color parsing error: {}", err)
        }
    }
}