SV *sv = newSV(0); leaks. You want SV *sv;

The other issue is because I forgot to cast it. newRV_noinc(hv) should be newRV_noinc(MUTABLE_SV(hv)).

Fixed in original.

In reply to Re^3: Passing integer pointer in XS? by ikegami
in thread Passing integer pointer in XS? by martin67

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