As your using the unsafe package your doing things which are not considered 
safe by the lanaguge so only imprecise interpretations are possible. My 
interpretation is, assuming that next words after p in memory are zeroed the 
you have effectively a slice that points to a backing array at *p, and a length 
and capacity of zero.

If the words following p were not see, you'd have some fun memory corruption 
bugs to chase down. 

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