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Created September 8, 2016 06:15
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Ruby meta-programming check
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demo.rb
class Demo
D = 10
end
d1 = Demo.new
d2 = Demo.new
def d1.check
D
end
class << d2
def check
D
end
end
d1.check ## NameError: uninitialized constant D
d2.check ## 10
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