Why not `module_function` is accesible inside the class scope?

ruby-talk
1

The below code is running properly :

module Mod
  def one
    "This is one"
  end
  module_function :one
end

Below is throwing error :

class Mod
  def one
    "This is one"
  end
  module_function :one
end

# ~> -:5:in `<class:Mod>': undefined method `module_function' for
Mod:Class (NoMethodError)
# ~> from -:1:in `<main>'

Why is such design?

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