* Ruby Module#include incompatibilities *.md

Module#include has incompatibilities between Ruby 2 and 3

Try to run the following example:

puts RUBY_VERSION

module IncludeModule
  def foo
    "foo from `IncludeModule`"
  end
end

module PrependModule
  def foo
    super
  end
end

class Service
  prepend PrependModule
end

service = Service.new

service.foo

Service.include IncludeModule

service.foo

Ruby 2 behaviour

Ruby 3 behaviour

More info

• Ruby Changes
• Bug #9573