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: image_layer.rs
    path of file: ./repos/neon/pageserver/src/tenant/storage_layer
    
    the code of the file until where you have to start completion: //! An ImageLayer represents an image or a snapshot of a key-range at
//! one particular LSN. It contains an image of all key-value pairs
//! in its key-range. Any key that falls into the image layer's range
//! but does not exist in the layer, does not 
    
    pub(super) async fn dump(&self, ctx: &RequestContext) -> anyhow::Result<()> {
        let block_reader = FileBlockReader::new(&self.file, self.file_id);
        let tree_reader = DiskBtreeReader::<_, KEY_SIZE>::new(
            self.index_start_blk,
            self.index_root_blk,
            block_reader,
        );

        tree_reader.dump().await?;

        tree_reader
            .visit(
                &[0u8; KEY_SIZE],
                VisitDirection::Forwards,
                |key, value| {
                    println!("key: {} offset {}", hex::encode(key), value);
                    true
                },
                ctx,
            )
            .await?;

        Ok(())
    }