remove unused std::mem
use crate::prelude::*;
use crate::{scalar, Point, Point3, RSXform, Rect, Scalar, Size, Vector};
use skia_bindings::{C_SkMatrix_SubscriptMut, SkMatrix, SkMatrix_ScaleToFit};
-use std::mem;
use std::ops::{Index, IndexMut};
bitflags! {
