failure

failure is a deprecated and unmaintained Rust error-handling crate. RustSec classifies it as end-of-life with no future updates. Its docs.rs page includes an explicit deprecation notice.

Migration paths:

• failure::Error -> anyhow Error or eyre Report
• #[derive(Fail)] -> thiserror #[derive(Error)] (or snafu for structured context)

Do not use failure in new code. If you encounter it in a dependency, consider it a signal that the dependency may itself be unmaintained. See error-chain for the other major legacy crate, and rust-error-crate-comparison for the modern landscape.