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pub fn parse_connection_string(s: &str) -> Result<ConnectionConfig, ConfigError> {
    let parts: Vec<&str> = s.splitn(2, "://").collect();
    if parts.len() != 2 {
        return Err(ConfigError::MissingScheme);
    }
    let scheme = Scheme::try_from(parts[0])?;
    let rest = parts[1];
    ConnectionConfig::from_parts(scheme, rest)
}

/// Parses a connection string into a validated `ConnectionConfig`.
///
/// Expects the format `scheme://host[:port][/path][?query]`. The scheme
/// must be one of the variants supported by `Scheme` (see
/// [`Scheme::try_from`]).
///
/// # Errors
///
/// Returns `ConfigError::MissingScheme` if the input does not contain
/// `://`. Returns `ConfigError::UnknownScheme` if the scheme prefix is
/// not recognised. Propagates any error from `ConnectionConfig::from_parts`.
///
/// # Examples
///
/// ```
/// let cfg = parse_connection_string("postgres://localhost:5432/mydb")?;
/// assert_eq!(cfg.port(), Some(5432));
/// ```
pub fn parse_connection_string(s: &str) -> Result<ConnectionConfig, ConfigError> {