[m-dev.] for review: deep_copy() bug fix

[Tyson Richard DOWD]

> Hi Tyson,
> 
> Could you please review this one?

This looks fine. Thanks.

-- 
       Tyson Dowd           #
                            #             Sign on refrigerator:
     trd at cs.mu.oz.au        #           Refrigerate after opening. 
http://www.cs.mu.oz.au/~trd #                  - C. J. Owen.