Installation on rainbow 2.2.2 on ruby 2.4.0 broken

[parkr]

Adding rainbow ~> 2.2 to my Gemfile and running bundle install, I see:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    can't modify frozen String

Gem files will remain installed in
/var/lib/jenkins/workspace/vendor/gems/ruby/2.4.0/gems/rainbow-2.2.2 for
inspection.
Results logged to
/var/lib/jenkins/workspace/vendor/gems/ruby/2.4.0/extensions/x86_64-linux/2.4.0-static/rainbow-2.2.2/gem_make.out

An error occurred while installing rainbow (2.2.2), and Bundler cannot continue.
Make sure that `gem install rainbow -v '2.2.2'` succeeds before bundling.

I expected it to install properly. Is this a known issue? Is there any other information I can provide to help debug this?

[olleolleolle]

@parkr We're about to get 3.0 out soon.

[parkr]

Ah, ok, great! 👍