brew doctor Some installed kegs have no formulae!

发表于 Disqus：

brew 4.0.0 之后运行 doctor 显示

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Warning: Some installed kegs have no formulae!
This means they were either deleted or installed manually.
You should find replacements for the following formulae:
  pycparser
  cffi
  erdtree

虽然没什么影响但看着不爽

可以通过brew untap homebrew/core解决

原因是

It removes the local copy of the tap repository (see manpage). This is fine if you do not work on the repository, because the default option since brew 4.0.0 is to fetch formulae information from the JSON API (see 4.0.0 release notes). If you run brew doctor, you should see that the homebrew/core tap has not been updated for a while.

大致就是走 JSON API 了，homebrew/core 也不维护升级了，所以本地那份也别留着了

参考：