File: constant_visibility.rb

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module ConstantVisibility
  module PrivConstModule
    PRIVATE_CONSTANT_MODULE = true
    private_constant :PRIVATE_CONSTANT_MODULE
    
    def self.private_constant_from_self
      PRIVATE_CONSTANT_MODULE
    end
    
    def self.defined_from_self
      defined? PRIVATE_CONSTANT_MODULE
    end
    
    module Nested
      def self.private_constant_from_scope
        PRIVATE_CONSTANT_MODULE
      end
      
      def self.defined_from_scope
        defined? PRIVATE_CONSTANT_MODULE
      end
    end
  end
  
  class PrivConstClass
    PRIVATE_CONSTANT_CLASS = true
    private_constant :PRIVATE_CONSTANT_CLASS
    
    def self.private_constant_from_self
      PRIVATE_CONSTANT_CLASS
    end
      
    def self.defined_from_self
      defined? PRIVATE_CONSTANT_CLASS
    end
    
    module Nested
      def self.private_constant_from_scope
        PRIVATE_CONSTANT_CLASS
      end
      
      def self.defined_from_scope
        defined? PRIVATE_CONSTANT_CLASS
      end
    end
  end
  
  class PrivConstModuleChild
    include PrivConstModule
    
    def private_constant_from_include
      PRIVATE_CONSTANT_MODULE
    end
      
    def defined_from_include
      defined? PRIVATE_CONSTANT_MODULE
    end
  end
  
  class PrivConstClassChild < PrivConstClass
    def private_constant_from_subclass
      PRIVATE_CONSTANT_CLASS
    end
      
    def defined_from_subclass
      defined? PRIVATE_CONSTANT_CLASS
    end
  end
  
  def self.reset_private_constants
    Object.send :private_constant, :PRIVATE_CONSTANT_IN_OBJECT
  end
end

class Object
  PRIVATE_CONSTANT_IN_OBJECT = true
  private_constant :PRIVATE_CONSTANT_IN_OBJECT
end