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#define SvREFCNT(sv)     (sv)->sv_refcnt
#define SvREFCNT_inc(sv) ((PL_Sv=MUTABLE_SV(sv)) ? (++(SvREFCNT(PL_Sv)
+),PL_Sv) : NULL)

SvREFCNT_inc(sv)

++( (sv)->sv_refcnt )