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クラスメソッドからプライベートメソッドが呼べない件

Posted at
class A
  def self.x
    a = A.new
    a.y
  end

  private

  def y
  end
end

A.x
=>
  `x': private method `y' called for #<A:0x007fe5c0922fb8> (NoMethodError)
  from 13:in `<main>'

なんで……?

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