[shepmaster]

I don't think you need a lint. When you define the error type returned by `handle_request`, you decide how the error type returned by `handle_request` will be incorporated. If you've decided to implement `From` then you've decided you don't want/need to add context. Otherwise, the compiler will give you an error when you use `?`.

The time I can think this won't work is when you are reusing error types across places. Recently, I've been experimenting with creating a lot of error types, so far as one unique error type per function. I haven't done this for long enough to have a real report, but I haven't hated it so far.