What I dislike about *all* the dynamic `Error` strategies is that we can't have something that is both `From<E: Error>` and `impl Error` at the same time. ;__________;
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The former makes `?` work for interop with functions that return `Result<T, Box<dyn StdError>>`. The latter makes anyhow::Error work as a #[source] e.g. within `thiserror`'s derive(Error).
Neither of those actually require a StdError impl for anyhow::Error, though it's common for people to assume they would.