Inline support on protoype

I was hoping to use inline documentation to generate proper type signatures, but it doesn't seem to be working at the moment. I have a PR with everything set up to demonstrate here.

Here is the gist, though:

I expect that this calculator.rb file:

class Calculator
  # @rbs (Integer, Integer) -> Integer
  def add(a, b)
    a + b
  end
end

And after running this command:

bin/rbs prototype rb lib/calculator.rb > sig/lib/calculator.rbs

Would produce this sig/lib/calculator.rbs file:

class Calculator
  def add: (Integer a, Integer b) -> Integer
end

But at the moment, it produces this:

class Calculator
  # @rbs (Integer, Integer) -> Integer
  def add: (untyped a, untyped b) -> untyped
end

All this with the current specs:

❯ ruby --version
ruby 3.2.7 (2025-02-04 revision 02ec315244) [arm64-darwin23]
❯ bundle info rbs
  * rbs (4.0.0.dev.4 8a97819)
	Summary: Type signature for Ruby.
	Homepage: https://github.com/ruby/rbs
	Source Code: https://github.com/ruby/rbs.git
	Changelog: https://github.com/ruby/rbs/blob/master/CHANGELOG.md
	Path: /Users/aemadrid/.local/share/mise/installs/ruby/3.2.7/lib/ruby/gems/3.2.0/bundler/gems/rbs-8a97819d4419

Is this something that is in the works but not quite ready?

The reproduction uses lib/calculator.rb and bin/rbs prototype rb, with output in sig/lib/calculator.rbs. Start by running that command and tracing the prototype path to see why the inline annotation remains a comment. Done means the generated signature uses Integer parameters and return type as shown.