lol.rb

class Shape
  def self.desc(str)
    @@description = str
  end

  def self.description
    @@description
  end
end

class Circle < Shape
  desc "A round shape"
end

class Square < Shape
  desc "A quadrilateral"
end

puts Circle.description
puts Square.description

# Actual output:
#   A quadrilateral
#   A quadrilateral
# Expected:
#   A round shape
#   A quadrilateral