PN_DEREF          606 core/vm.c                reg[op.a] = PN_DEREF(locals[op.b]);
PN_DEREF          614 core/vm.c                PN_DEREF(locals[op.b]) = reg[op.a];
PN_DEREF          619 core/vm.c            CASE(GETUPVAL, reg[op.a] = PN_DEREF(upvals[op.b]) )
PN_DEREF          621 core/vm.c              PN_DEREF(upvals[op.b]) = reg[op.a];