Try harder to confine the user, and instruct them not to create new Errors.

[EvanCarroll]

I learned a lot messing with exercises/error_handling/errorsn.rs but it wasn't an especially good experience. Without more information, you can go down a pretty horrible rabbit hole here. I think we should do a better job to

• confine the user into just modifying that function
• inform the user that they needn't create new errors.

I believe both of these are failures of the instructions and not hints. Find more information here,

https://stackoverflow.com/q/61626705/124486