Indeed, much of what Failure did well has since been upstreamed into Rust's own std::error::Error type. The modern recommendations for error handling convenience libs are thiserror (for library crates, where you want to define errors) and anyhow (for binary crates, where you just want to consume errors), both of which are from the author of Serde.

[EDIT: Also snafu, hello there Shepmaster :P ]