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    *    *Assignments*

...

         The subroutine for the assignment variant of an operator is
         required only to return the result of the operation.

void overload_add_eq(pTHX_ SV * a, SV * b, SV * third) {
     dXSARGS;
...
     mpz_add_ui(*(INT2PTR(mpz_t *, SvIVX(SvRV(a)))), *(INT2PTR(mpz_t *
+, SvIVX(SvRV(a)))), SvUV(b));
     XSRETURN(1);
}

void
overload_add_eq (a, b, third)
...
        CODE:
        overload_add_eq (aTHX_ a, b, third);
        XSRETURN(1);