capture inherited method before redefining it

capture_parent_method.rb

class A
  def self.hi
    'hi from A'
  end
end
 
class B < A
  class << self
    alias_method :b, :hi
  end
  
  def self.hi
    'hi from B'
  end
end
 
puts B.hi
puts B.b

#hi from B
#hi from A