guard_inspect_key() public

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# File lib/pp.rb, line 108
    def guard_inspect_key
      if Thread.current[:__recursive_key__] == nil
        Thread.current[:__recursive_key__] = {}.untrust
      end

      if Thread.current[:__recursive_key__][:inspect] == nil
        Thread.current[:__recursive_key__][:inspect] = {}.untrust
      end

      save = Thread.current[:__recursive_key__][:inspect]

      begin
        Thread.current[:__recursive_key__][:inspect] = {}.untrust
        yield
      ensure
        Thread.current[:__recursive_key__][:inspect] = save
      end
    end
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