macos - brew update: ターミナル mac でのエラー

Question

error: Your local changes to the following files would be overwritten by merge:
    Library/Contributions/brew_bash_completion.sh
    Library/Contributions/brew_fish_completion.fish
    Library/Contributions/brew_zsh_completion.zsh
    Library/Contributions/manpages/brew.1.md
        ...

    Library/Formula/dmtx-utils.rb
    Library/Formula/docbook-xsl.rb
    Library/Formula/dromeaudio.rb
    Library/Formula/dub.rb
    Library/Formula/dvorak7min.rb
    Library/Formula/dyld-headers.rb
    Library/Formula/dylibbundler.rb
    Library/For
Aborting
Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/master