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- >> module A
- >> def a
- >> puts "a"
- >> end
- >> module B
- >> def b
- >> puts "b"
- >> end
- >> end
- >> end
- => nil
- >> class C
- >> extend A::B
- >> end
- => C
- >> C.a
- NoMethodError: undefined method `a' for C:Class
- from (irb):41
- >> C.b
- b
- => nil
- >>
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