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use error_chain::error_chain; error_chain! { types { EdbError, EdbErrorKind, EdbResultExt, EdbResult; } foreign_links { Fs(toml::de::Error); Io(std::io::Error); Request(reqwest::Error); Url(reqwest::UrlError); FromUtf8(std::string::FromUtf8Error); FromJson(serde_json::Error); } }