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: mod.rs
    path of file: ./repos/ckb/script/src/syscalls
    
    the code of the file until where you have to start completion: mod current_cycles;
mod current_memory;
mod debugger;
mod exec;
mod get_memory_limit;
mod load_block_extension;

    
    fn parse_from_u64(i: u64) -> Result<Place, Error> {
        match i {
            0 => Ok(Place::CellData),
            1 => Ok(Place::Witness),
            _ => Err(Error::External(format!("Place parse_from_u64 {i}"))),
        }
    }