Initial version

Author: nobu

README.md

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+# ruby2_keywords
+
+Provides empty `Module#ruby2_keywords` method, for the forward
+source-level compatibility against ruby2.7 and ruby3.
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'ruby2_keywords'
+```
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install ruby2_keywords
+
+## Usage
+
+```ruby
+require 'ruby2_keywords'
+
+module YourModule
+  ruby2_keywords def oldstyle_keywords(options = {})
+  end
+end
+```
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://bugs.ruby-lang.org.
+
+## License
+
+The gem is available as open source under the terms of the [2-Clause BSD License](https://opensource.org/licenses/BSD-2-Clause).

lib/ruby2_keywords.rb

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+class Module
+  unless respond_to?(:ruby2_keywords, true)
+    private
+    def ruby2_keywords(*)
+      # nil
+    end
+  end
+end

ruby2_keywords.gemspec

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+version = "0.0.0"
+
+Gem::Specification.new do |s|
+  s.name = "ruby2_keywords"
+  s.version = version
+  s.summary = "Shim library for Module#ruby2_keywords"
+  s.homepage = "https://www.ruby-rang.org/"
+  s.licenses = ["Ruby"]
+  s.require_paths = ["lib"]
+  s.files = [
+    "lib/ruby2_keywords.rb",
+    "ruby2_keywords.gemspec",
+  ]
+end