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: wait.rs
    path of file: ./repos/fantoccini/src
    
    the code of the file until where you have to start completion: //! Allow to wait for conditions.
//!
//! Sometimes it is necessary to wait for a browser to achieve a certain state. For example,
//! navigating 
    
    /// # async fn main() -> Result<(), fantoccini::error::CmdError> {
    /// # #[cfg(all(feature = "native-tls", not(feature = "rustls-tls")))]
    /// # let client = ClientBuilder::native().connect("http://localhost:4444").await.expect("failed to connect to WebDriver");
    /// # #[cfg(feature = "rustls-tls")]
    /// # let client = ClientBuilder::rustls().connect("http://localhost:4444").await.expect("failed to connect to WebDriver");
    /// # #[cfg(all(not(feature = "native-tls"), not(feature = "rustls-tls")))]
    /// # let client: fantoccini::Client = unreachable!("no tls provider available");
    /// // -- snip wrapper code --
    /// let button = client.wait().for_element(Locator::Css(
    ///     r#"a.button-download[href="/learn/get-started"]"#,
    /// )).await?;
    /// // -- snip wrapper code --
    /// # client.close().await
    /// # }