I32 riter = HvRITER(hv);
HE *eiter = HvEITER(hv);
hv_iterinit(hv);
- while (items
- && (entry
- = hv_iternext_flags(hv, HV_ITERNEXT_WANTPLACEHOLDERS))) {
+ /* This may look suboptimal with the items *after* the iternext, but
+ it's quite deliberate. We only get here with items==0 if we've
+ just deleted the last placeholder in the hash. If we've just done
+ that then it means that the hash is in lazy delete mode, and the
+ HE is now only referenced in our iterator. If we just quit the loop
+ and discarded our iterator then the HE leaks. So we do the && the
+ other way to ensure iternext is called just one more time, which
+ has the side effect of triggering the lazy delete. */
+ while ((entry = hv_iternext_flags(hv, HV_ITERNEXT_WANTPLACEHOLDERS))
+ && items) {
SV *val = hv_iterval(hv, entry);
if (val == &PL_sv_undef) {