Broken brew cu

[stangri]

For about a week now, on some of my macs (macOS 10.13.6) the brew cu has been broken:

$ brew cu
==> Options
Include auto-update (-a): false
Include latest (-f): false
==> Updating Homebrew
Already up-to-date.
==> Finding outdated apps
Error: private method `load' called for Hbc:Module
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:45:in `rescue in load_cask'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:42:in `load_cask'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:14:in `block in installed_apps'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:11:in `map'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:11:in `installed_apps'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/bcu.rb:66:in `find_outdated_apps'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/bcu.rb:24:in `process'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/cmd/brew-cu.rb:34:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/Homebrew/Library/Homebrew/utils.rb:18:in `require?'
/usr/local/Homebrew/Library/Homebrew/brew.rb:106:in `<main>'

On other macs (I can't check now, but I suspect they are not on macOS 10.13.6 yet) it works fine. I have no idea how to troubleshoot this tho. I've tried to install ruby thru homebrew, but it didn't seem to help:

$ brew install ruby
==> Installing dependencies for ruby: libyaml
==> Installing ruby dependency: libyaml
==> Downloading https://homebrew.bintray.com/bottles/libyaml-0.2.1.high_sierra.bottle.tar.gz
######################################################################## 100.0%
==> Pouring libyaml-0.2.1.high_sierra.bottle.tar.gz
🍺  /usr/local/Cellar/libyaml/0.2.1: 9 files, 298.9KB
==> Installing ruby
==> Downloading https://homebrew.bintray.com/bottles/ruby-2.5.1.high_sierra.bottle.tar.gz
######################################################################## 100.0%
==> Pouring ruby-2.5.1.high_sierra.bottle.tar.gz
==> Caveats
Emacs Lisp files have been installed to:
  /usr/local/share/emacs/site-lisp/ruby
==> Summary
🍺  /usr/local/Cellar/ruby/2.5.1: 16,227 files, 27.5MB
==> Caveats
==> ruby
Emacs Lisp files have been installed to:
  /usr/local/share/emacs/site-lisp/ruby

$ brew cu
==> Options
Include auto-update (-a): false
Include latest (-f): false
==> Updating Homebrew
Already up-to-date.
==> Finding outdated apps
Error: private method `load' called for Hbc:Module
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:45:in `rescue in load_cask'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:42:in `load_cask'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:14:in `block in installed_apps'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:11:in `map'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/extend/hbc.rb:11:in `installed_apps'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/bcu.rb:66:in `find_outdated_apps'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/lib/bcu.rb:24:in `process'
/usr/local/Homebrew/Library/Taps/buo/homebrew-cask-upgrade/cmd/brew-cu.rb:34:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/Homebrew/Library/Homebrew/utils.rb:18:in `require?'
/usr/local/Homebrew/Library/Homebrew/brew.rb:106:in `<main>'

Help please.

[giacgbj]

@stangri Please read #100. You'll quite surely find a solution and it would probably be removing the packages listed running che command:

brew cask outdated 

[stangri]

@giacgbj Thank you, removing /usr/local/Caskroom/cdock helped!

[yurikoles]

Upstream issue: Homebrew/homebrew-cask#49716