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: front.rs
    path of file: ./repos/CYFS/src/component/cyfs-lib/src/base
    
    the code of the file until where you have to start completion: use cyfs_base::*;

#[derive(Clone, Copy, Eq, PartialEq
    
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let mode = match s {
            "forbidden" => Self::Forbidden,
            "strict" => Self::Strict,
            "relaxed" => Self::Relaxed,
            "none" => Self::None,
            _ => {
                let msg = format!("unknown browser mode: {}", s);
                warn!("{}", msg);
                return Err(BuckyError::new(BuckyErrorCode::InvalidData, msg));
            }
        };
        Ok(mode)
    }