I'm playing with this pattern, but it seems like it forces you to have a variant for every upstream error. For instance, I have this DatabaseError:

	#[derive(Clone, Debug, Error)]
	pub enum DatabaseError {
	    #[error("database error: {0}")]
	    Database(String),
	    #[error("failed to deserialize from DB: {0}")]
	    Deserialize(String),
	    #[error("failed to serialize input: {0}")]
	    Serialize(String),
	    #[error("unexpected error: {0}")]
	    Unexpected(String),
	}

But I might have 2 or 3 error types that turn into DatabaseError::Serialize. Then I end up doing custom From impls. Then I realize serde might be Serialize or Deserialize, so I'm back where I started.

Though I would like to have that chain of errors, but I haven't figured out how to do the custom impl From yet (or if it ends up being useful in my case, even).

Thanks for the ideas.