How to find missing methods?

[connorshea]

For example, Range is currently missing the minmax method that was added in Ruby 2.7.

https://github.com/ruby/ruby-signature/blob/117a94a55380a2bfa04f3f383822dfc563a4312d/stdlib/builtin/range.rbs

Is there any way to find methods that aren't represented in the ruby-signature type library, and if not should we create some way of doing that? Having a way of tracking 'type coverage' for the Ruby core and stdlib classes would probably be pretty useful.

[ghost]

I think rbs prototype runtime --merge CLASS.
Please see https://github.com/ruby/ruby-signature/blob/master/docs/CONTRIBUTING.md#steps-for-contribution in No.4

[connorshea]

I wrote a script to find methods and aliases that are missing from an RBS by using the runtime prototyper:

ruby-signature connorshea$ bundle exec bin/find_missing --patterns=Module stdlib/builtin/module.rbs
Opening stdlib/builtin/module.rbs...
Missing methods:
- const_source_location
- deprecate_constant
- pretty_print
- pretty_print_cycle
- undef_method
- initialize_clone
- initialize_copy
- method_undefined
- ruby2_keywords

Missing aliases:
- alias inspect to_s

It's pretty hacky, and there are methods that shouldn't be in here like pretty_print (that's mixed in, idk how to filter those out), but it works pretty well.

[connorshea]

I think rbs prototype runtime --merge CLASS.
Please see https://github.com/ruby/ruby-signature/blob/master/docs/CONTRIBUTING.md#steps-for-contribution in No.4

That's almost what I want, but it adds a lot of extra stuff to the RBS file that gets output, and I just want to know what the RBS file is missing :)