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: other.rs
    path of file: ./repos/ethers-rs/ethers-core/src/types
    
    the code of the file until where you have to start completion: //! Support for capturing other fields
use serde::{de::DeserializeOwned, Deserialize, Serialize};
us
    
    /// # fn d(mut other: OtherFields) {
    ///
    /// /// Additional Optimism transaction fields
    /// #[derive(Deserialize)]
    /// #[serde(rename_all = "camelCase")]
    /// struct OptimismExtraFields {
    ///  pub l1_tx_origin : Option<Address>,
    ///  pub l1_timestamp : U64,
    ///  pub l1_block_number : U64,
    /// }
    ///
    /// let optimism: OptimismExtraFields = other.deserialize_into().unwrap();
    /// # }