[macOS General] Homebrew: brew doctor で Error: Failed to import が表示された場合の対処

memo.

[markdown]
`brew prune` を実行する。

> * [brew doctor reports Error: Failed to import: node4 · Issue #18237 · Homebrew/homebrew](https://github.com/Homebrew/homebrew/issues/18237)

“`prettyprinted
% brew doctor
Error: Failed to import: firefox-esr-us
No available formula for firefox-esr-us
Your system is ready to brew.
% brew prune
Pruned 1 dead formula
Tapped 2 formula
Pruned 0 symbolic links and 2 directories from /usr/local
% brew cleanup
% brew update
Already up-to-date.
% brew tap –repair
Pruned 0 dead formula
Tapped 2 formula
% brew doctor
Your system is ready to brew.
“`
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