PN_FLEX_AT        506 core/gc.c              GC_MINOR_UPDATE(PN_FLEX_AT(ptr, i));
PN_FLEX_AT        623 core/gc.c              GC_MAJOR_UPDATE(PN_FLEX_AT(ptr, i));
PN_FLEX_AT        278 core/objmodel.c     vPN(Vtable) vt = (struct PNVtable *)PN_FLEX_AT(P->vts, i);
PN_FLEX_AT        136 core/potion.h  #define PN_VTABLE(t)    (PN_FLEX_AT(P->vts, PN_TYPE_ID(t)))