Created
May 28, 2019 07:32
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test singleton class
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| def A | |
| def say | |
| p "in A" | |
| end | |
| end | |
| a = A.new | |
| def a.say | |
| p "in singleton" | |
| end | |
| a.say | |
| b = A.new | |
| b.say |
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