Example of how lazy enumerables break when you try to refine methods into them

broken_lazy_refinement.rb

module LockedEnumeration
  refine Enumerator::Lazy do
    def refined
      if block_given?
        each { |el| yield el }
      else
        enum_for(:refined)
      end
    end
  end
end

using LockedEnumeration

Enumerator.new {}.lazy.refined # => #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator: #<Enumerator::Generator:0x0000555ee6935428>:each>>:refined>

Enumerator.new {}.lazy.refined.to_a # => undefined method `refined' for #<Enumerator::Lazy:0x0000555ee692fc08> (NoMethodError)