private_method_defined?(p1) public

Returns true if the named private method is defined by _ mod_ (or its included modules and, if mod is a class, its ancestors). 

   module A
     def method1()  end
   end
   class B
     private
     def method2()  end
   end
   class C < B
     include A
     def method3()  end
   end

   A.method_defined? :method1            #=> true
   C.private_method_defined? "method1"   #=> false
   C.private_method_defined? "method2"   #=> true
   C.method_defined? "method2"           #=> false
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