Custom Errors Are Non-Negotiable in My Rust Applications (tristonarmstrong.com)

This is even easier with the thiserror crate:

   #[derive(Debug, Error)
   enum AppError {
       #[error("io: {0}")]
       Io(#[from] io::Error)
   }

Automatically generates From impls like this and a Display impl that lets you describe the error case with more detail. Very very good ergonomics and completely transparent to downstream libraries.

is that supposed to be https://tristonarmstrong.com/blog/custom-rust-errors ?