You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: storage.rs
    path of file: ./repos/wgpu/wgpu-core/src
    
    the code of the file until where you have to start completion: use std::ops;
use std::sync::Arc;

use wgt::Backend;

use crate::id::Id;
use crate::resource::Resource;
use crate::{Epoch, Index};

/// An entry in a `Storage::map` table.
#[derive(Debug)]
pub(crate) enum Element<T> {
    /// There are no live ids with this index.
    Vacant,

    /// There is one live id with this index, allocated at the given
    /// epoch.
    Occupied(Arc<T>, Epoch),

    /// Like `Occupied`, but an error occurred when creating the
  
    
    pub(crate) fn replace_with_error(&mut self, id: Id<T::Marker>) -> Result<Arc<T>, InvalidId> {
        let (index, epoch, _) = id.unzip();
        match std::mem::replace(
            &mut self.map[index as usize],
            Element::Error(epoch, String::new()),
        ) {
            Element::Vacant => panic!("Cannot access vacant resource"),
            Element::Occupied(value, storage_epoch) => {
                assert_eq!(epoch, storage_epoch);
                Ok(value)
            }
            _ => Err(InvalidId),
        }
    }