I took a look at fehler but the thing that kept me from forming an opinion is I have no idea what things look like at the call site - and couldn't find examples

I took a look at fehler but the thing that kept me from forming an opinion is I have no idea what things look like at the call site - and couldn't find examples in the docs. If the ONLY thing fehler does is Ok-wrapping on the annotated function, then I can see the value in it, but it doesn't seem like a big deal. Useful, but not worth being added to the language when the proc macro is so complete. (I also see the argument against it - I personally enjoy seeing Result<foo,bar> rather than the Ok-wrapped version, but I see this as a _preference_.) If the caller is just a wrapper around a function doing Ok-wrapping, the caller must either also Ok-wrap or return Result<_,_>. It's at this point I feel like I'm missing something because he made an ergonomic argument about NOT needing to update things in many places, which seems to contradict this.