Minalist check that there is no memory leak.

src/vtab/array.rs

@@ -197,11 +197,13 @@ mod test {
         let mut stmt = db.prepare("SELECT value from rarray(?);").unwrap();
 
         let rows = stmt.query_map(&[&ptr], |row| row.get::<_, i64>(0)).unwrap();
+        assert_eq!(2, Rc::strong_count(&ptr));
         let mut count = 0;
         for (i, value) in rows.enumerate() {
             assert_eq!(i as i64, value.unwrap()-1);
             count += 1;
         }
         assert_eq!(4, count);
+        assert_eq!(1, Rc::strong_count(&ptr));
     }
 }