Error: undefined method `args' for Homebrew:Module

[hcguersoy]

Today, I run into the following error:

brew rmtree gnutls
Error: undefined method `args' for Homebrew:Module
/opt/homebrew/bin/brew-rmtree.rb:528:in `main'
/opt/homebrew/bin/brew-rmtree.rb:553:in `<top (required)>'
/opt/homebrew/Library/Homebrew/utils.rb:92:in `require'
/opt/homebrew/Library/Homebrew/utils.rb:92:in `require?'
/opt/homebrew/Library/Homebrew/brew.rb:112:in `<main>'

Some info:

brew --version
Homebrew 3.5.1
Homebrew/homebrew-core (git revision c6001df23ba; last commit 2022-06-10)
Homebrew/homebrew-cask (git revision 3ee16f9e6e; last commit 2022-06-10)

# rmtree is installed here:
pwd
/opt/homebrew/Library/Taps/beeftornado/homebrew-rmtree

# and the rmtree revision is:
git rev-parse HEAD
e755439c5cf529ba1dfb93bfd2d2440ed0adbe91