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/scraper/src
    
    the code of the file until where you have to start completion: //! Custom error types for diagnostics
//! Includes re-exported error types from dependencies

mod utils;

use std::{error::Error, fmt::Display};

use cssparser::{BasicPars
    
    fn description(&self) -> &str {
        match self {
            Self::UnexpectedToken(_) => "Token was not expected",
            Self::EndOfLine => "Unexpected EOL",
            Self::InvalidAtRule(_) => "Invalid @-rule",
            Self::InvalidAtRuleBody => "The body of an @-rule was invalid",
            Self::QualRuleInvalid => "The qualified name was invalid",
            Self::ExpectedColonOnPseudoElement(_) => "Missing colon character on pseudoelement",
            Self::ExpectedIdentityOnPseudoElement(_) => "Missing pseudoelement identity",
            Self::UnexpectedSelectorParseError(_) => "Unexpected error",
        }
    }