They're external crates that either generate Error implementations (thiserror) or act as dynamic wrappers implementing Error (anyhow), so they're more than a simple hand-written implementation. But the developer experience of pulling thiserror or anyhow off the shelf can certainly be more convenient than the hand-written implementation, sure.
They're external crates that either generate Error implementations (thiserror) or act as dynamic wrappers implementing Error (anyhow), so they're more than a simple hand-written implementation. But the developer experience of pulling thiserror or anyhow off the shelf can certainly be more convenient than the hand-written implementation, sure.