As an example of the kind of specificity you might want, take a look at the error type for parsing a regular expression: https://docs.rs/regex-syntax/0.4.0/rege

As an example of the kind of specificity you might want, take a look at the error type for parsing a regular expression: https://docs.rs/regex-syntax/0.4.0/regex_syntax/enum.ErrorKind.html https://docs.rs/regex-syntax/0.4.0/regex_syntax/enum.ErrorKi... Now, in most cases, callers don't care at all about which specific error happened. They just want to print the error and be done with it. And that works just fine, because of the error handling machinery. But if you do want to drill down, then the option is there for you.