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: types.rs
    path of file: ./repos/habitat/components/core/src/tls/rustls_wrapper
    
    the code of the file until where you have to start completion: //! Types for reading certificates, private keys, and root certificate stores from the CLI. These
//! types act as a bridge from the CLI to interior types. These types implement `FromStr` (opposed
//! to `Fr
    
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let path = PathBuf::from(s);
        let certificates = if path.is_dir() {
            ctl_gateway::latest_certificates(&path)?
        } else {
            rustls_wrapper::certificates_from_file(&path)?
        };
        Ok(Self { path, certificates })
    }