所以基本上我正在制作一个需要成员可变的结构，因为同一个成员将被另一个将改变它的函数借用，如下所示：

fn chunk(&mut self) -> gdnative::Ref<ArrayMesh>{
        let st = SurfaceTool::new();

//      st.begin(Mesh::PRIMITIVE_TRIANGLES);
        st.begin(Mesh::PRIMITIVE_LInes);
        

        for x in 0..self.size.0{
            for y in 0..self.size.1{
                for z in 0..self.size.2{
                    VoxelChunk::custom_voxel(
                        &st,Vector3::new(x as f32 + self.pos.x,y as f32  + self.pos.y,z as f32 + self.pos.z),&self.data
                        );
                }
            }
        }
        

        st.generate_normals(false);
        let mesh: Ref<ArrayMesh> = st.commit(gdnative::Null::null(),Mesh::ARRAY_COMPRESS_DEFAULT).unwrap();
        godot_print!("commited mesh!");
        return mesh;
    }

功能：

fn custom_voxel(st:&Ref<SurfaceTool,Unique>,pos:Vector3,data: &mut Vec<u8>){
//it has a lot of stuff so im not gonna put in here 
}

它给了我这个，但我不知道如何使该成员成为可变引用

error[E0308]: mismatched types
   --> src/lib.rs:114:7
    |
114 |                         &self.data
    |                         ^^^^^^^^^^ types differ in mutability
    |
    = note: expected mutable reference `&mut Vec<u8>`
                       found reference `&Vec<u8>`

error: aborting due to previous error; 1 warning emitted

For more information about this error,try `rustc --explain E0308`.