Occasionally, when failing to `brew install` or `brew upgrade` a formula, users will get an error message and the last line of it will be:
```
Error: Validation Failed: [{"message"=>"The listed users and repositories cannot be searched either because the resources do not exist or you do not have permission to view them.", "resource"=>"Search", "field"=>"q", "code"=>"invalid"}]
```
Here's an old public example: https://gitlab.com/tabos/rogerrouter/-/issues/21
At Square, this error can be caused by a transient issue with a user's GitHub credentials.
My proposal is that any error which prevents `brew` from showing related issues should:
1. Not cause `brew` to exit early (vs. printing diagnostic checks and doing any other cleanup)
2. Be clearly differentiated from the original failure (so it doesn't become a red herring for users troubleshooting their broken formula)
The main class you should look at is the {Formula} class (and classes linked from there). That's the class that's used to create Homebrew formulae (i.e. package descriptions). Assume anything else you stumble upon is private.
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