brew doctor will throw a warning:
Warning: Found Ruby file outside goodwithtech/r tap formula directory.
(/opt/homebrew/Library/Taps/goodwithtech/homebrew-r/Formula):
/opt/homebrew/Library/Taps/goodwithtech/homebrew-r/dockle.rb
Reproduction:
brew install goodwithtech/r/dockle
brew doctor
There seems to be a duplicate docker.rb at https://github.com/goodwithtech/homebrew-r/blob/master/dockle.rb which is old and should be removed