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'Assertion ((svtype)((sv)->sv_flags & 0xff)) != 0xff failed: f...'
/* Sadly there are some parts of the core that have pointers to alread
SV heads, and rely on being able to tell that they are now free. So
them all by using a consistent macro. */
#define SvIS_FREED(sv) ((sv)->sv_flags == SVTYPEMASK)
/* delete a back-reference to ourselves from the backref magic associa
* with the SV we point to.
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