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⚡ ruby CONSTANT.rb
CONSTANT.rb:3:in `showConstant': uninitialized constant Foo::CONSTANT (NameError)
	from CONSTANT.rb:10:in `<main>'

class Foo
  def self.showConstant
    puts CONSTANT
  end
end
class SubFoo < Foo
  CONSTANT='SubFoo string'
end

SubFoo.showConstant