```ruby
# depends on: module.rb class.rb

def self.to_s
  "main"
end

module Rubinius
  AtExit = []
end

class NilClass
  alias_method :|, :^

  def call(*a)
    raise LocalJumpError, "not callable"
  end
end

NIL = nil

class TrueClass
  alias_method :inspect, :to_s
end

TRUE = true

class FalseClass
  alias_method :|, :^
  alias_method :inspect, :to_s
end

FALSE = false

Undefined = Object.new

module RecursionGuard
  def self.inspecting?(obj)
    stack.include?(obj.object_id)
  end

  def self.inspect(obj, &block)
    stack.push(obj.object_id)
    begin
      yield
    ensure
      stack.pop
    end
  end
  
  def self.stack
    stack = Thread.current[:inspecting] ||= []
  end
end
```

Add some missing methods to the top-level object.
user
```ruby
# depends on: module.rb class.rb

class << MAIN
  def include(*mods)
    self.metaclass.include(*mods)
  end
  
  def public(*methods)
    self.metaclass.public(*methods)
  end
  
  def private(*methods)
    self.metaclass.private(*methods)
  end

  def protected(*methods)
    self.metaclass.protected(*methods)
  end
end

def self.to_s
  "main"
end

module Rubinius
  AtExit = []
end

class NilClass
  alias_method :|, :^

  def call(*a)
    raise LocalJumpError, "not callable"
  end
end

NIL = nil

class TrueClass
  alias_method :inspect, :to_s
end

TRUE = true

class FalseClass
  alias_method :|, :^
  alias_method :inspect, :to_s
end

FALSE = false

Undefined = Object.new

module RecursionGuard
  def self.inspecting?(obj)
    stack.include?(obj.object_id)
  end

  def self.inspect(obj, &block)
    stack.push(obj.object_id)
    begin
      yield
    ensure
      stack.pop
    end
  end
  
  def self.stack
    stack = Thread.current[:inspecting] ||= []
  end
end
```
assistant