_QWORD *__fastcall MiPopCombineBlock(_QWORD **a1){
_QWORD *result;
_QWORD *v2;
result = *a1;
if( *a1 == a1 )
return 0i64;
if( (_QWORD **)result[1] != a1 || (v2 = (_QWORD *)*result, *(_QWORD **)(*result + 8i64) != result) )
__fastfail(3u);
*a1 = v2;
v2[1] = a1;
return result;
}