On Sun, May 11, 2008 at 01:46:57AM -0000, John M. Dlugosz wrote:
: In S06, what is the difference between "is ref" and "is rw"?  The text says 
that the rw may be converted to an lvalue, and that ref must already be.  But 
what is that supposed to mean?  

Mostly that means that rw will cause autovivification and ref won't.


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