brew updateでエラーでたった[Homebrew]

$ brew update error: Your local changes to the following files would be overwritten by merge: Library/Formula/mysql.rb Please, commit your changes or stash them before you can merge. error: Your local changes to the following files would be overwritten by merge: README.md Please, commit your changes or stash them before you can merge. Aborting Error: Failure while executing: git pull -q origin ref

[takahiroki]

brew update で、 work tree が綺麗じゃないから git pull できないよ、と言われた場合 -> cd /usr/local で git fetch && git reset --hard origin/master

[shnkkb]

“git reset --hard origin/master”

[yamakozawa]

“git fetch origin”

[overleo]

真の問題解決情報。