indy-data-types 0.4.1

Common data types for Hyperledger Indy (https://www.hyperledger.org/projects), which provides a distributed-ledger-based foundation for self-sovereign identity (https://sovrin.org).
Documentation 
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macro_rules! unwrap_opt_or_return {
    ($opt:expr, $err:expr) => {
        match $opt {
            Some(val) => val,
            None => return $err,
        };
    };
}