brew install kidoman/tools/serve fails

[markpundsack]

==> Tapping kidoman/tools
Cloning into '/usr/local/Homebrew/Library/Taps/kidoman/homebrew-tools'...
remote: Counting objects: 4, done.
remote: Compressing objects: 100% (4/4), done.
remote: Total 4 (delta 0), reused 2 (delta 0), pack-reused 0
Unpacking objects: 100% (4/4), done.
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/kidoman/homebrew-tools/serve.rb
Calling Formula.sha1 is disabled!
Use Formula.sha256 instead.
/usr/local/Homebrew/Library/Taps/kidoman/homebrew-tools/serve.rb:6:in `<class:Serve>'
Please report this to the kidoman/tools tap!
Error: Cannot tap kidoman/tools: invalid syntax in tap!