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: error.rs
    path of file: ./repos/cargo-web/src
    
    the code of the file until where you have to start completion: use std::error;
use std::fmt;
use std::io;
use std::path::PathBuf;

u
    
    fn fmt( &self, formatter: &mut fmt::Formatter ) -> fmt::Result {
        use std::error::Error as StdError;
        match self {
            &Error::RuntimeError( _, ref inner ) => write!( formatter, "{}: {}", self.description(), inner ),
            &Error::CargoShimError( cargo_shim::Error::CargoFailed( ref message ) ) => write!( formatter, "{}", message ),
            &Error::CargoShimError( ref inner ) => write!( formatter, "{}", inner ),
            &Error::CannotLoadFile( ref path, ref inner ) => write!( formatter, "cannot load file {:?}: {}", path, inner ),
            &Error::CannotRemoveDirectory( ref path, ref inner ) => write!( formatter, "cannot remove directory {:?}: {}", path, inner ),
            &Error::CannotRemoveFile( ref path, ref inner ) => write!( formatter, "cannot remove file {:?}: {}", path, inner ),
            &Error::CannotCreateFile( ref path, ref inner ) => write!( formatter, "cannot create file {:?}: {}", path, inner ),
            &Error::CannotWriteToFile( ref path, ref inner ) => write!( formatter, "cannot write to file {:?}: {}", path, inner ),
            &Error::CannotCopyFile( ref src_path, ref dst_path, ref inner ) => write!( formatter, "cannot copy file from {:?} to {:?}: {}", src_path, dst_path, inner ),
            &Error::Other( ref inner ) => write!( formatter, "{}", inner ),
            _ => write!( formatter, "{}", self.description() )
        }
    }