* Sets the `time_zone_id` field from an IANA string by looking up the corresponding BCP-47 string.
* Errors if the string is not a valid BCP-47 time zone ID.
* @throws {@link FFIError}<{@link ICU4XError}>
*/
try_set_iana_time_zone_id_2(mapper: ICU4XTimeZoneIdMapper, id: string): void | never;