You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: locals.rb
    path of file: ./repos/concurrent-ruby/lib/concurrent-ruby/concurrent/atomic
    
    the code of the file until where you have to start completion: require 'fiber'
require 'concurrent/utility/en
    
    def locals!
      thread = Thread.current
      locals = thread[:concurrent_fiber_locals]

      unless locals
        locals = thread[:concurrent_fiber_locals] = []
        weak_synchronize do
          @all_arrays[locals.object_id] = locals
        end
        # When the fiber goes out of scope, we should delete the associated locals:
        ObjectSpace.define_finalizer(Fiber.current, thread_fiber_finalizer(locals.object_id))
      end