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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
+y-freed
   SV heads, and rely on being able to tell that they are now free. So
+ mark
   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
+ted
 * with the SV we point to.
...
{
...
    assert(!SvIS_FREED(av));