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- class A
- class << self
- def foo
- puts "foo"
- end
- end
- end
- A.foo
- class A
- class << self
- alias original_foo foo
- def foo
- puts "I say bar but only once.."
- alias foo original_foo
- end
- end
- end
- A.foo
- A.foo
- # => foo
- # => I say bar but only once..
- # => foo
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