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use failure::Fail; #[derive(Debug, Fail)] pub enum Error { #[fail(display = "not_found")] NotFoundError, #[fail(display = "mysql_error")] MySQLError(#[cause] mysql_async::error::Error), } impl From<mysql_async::error::Error> for Error { fn from(err: mysql_async::error::Error) -> Error { Error::MySQLError(err) } }