We no longer use config_var_description_t

  const char *initvalue; /**< String (or null) describing initial value. */

} config_var_t;

/** Represents an English description of a configuration variable; used when

 * generating configuration file comments. */

typedef struct config_var_description_t {

  const char *name;

  const char *description;

} config_var_description_t;

/** Type of a callback to validate whether a given configuration is

 * well-formed and consistent. See options_trial_assign() for documentation

 * of arguments. */