1// This is a part of Chrono.
2// See README.md and LICENSE.txt for details.
3
4//! The local (system) time zone.
5
6#[cfg(windows)]
7use std::cmp::Ordering;
8
9#[cfg(any(feature = "rkyv", feature = "rkyv-16", feature = "rkyv-32", feature = "rkyv-64"))]
10use rkyv::{Archive, Deserialize, Serialize};
11
12use super::fixed::FixedOffset;
13use super::{MappedLocalTime, TimeZone};
14#[allow(deprecated)]
15use crate::Date;
16use crate::naive::{NaiveDate, NaiveDateTime, NaiveTime};
17use crate::{DateTime, Utc};
18
19#[cfg(unix)]
20#[path = "unix.rs"]
21mod inner;
22
23#[cfg(windows)]
24#[path = "windows.rs"]
25mod inner;
26
27#[cfg(all(windows, feature = "clock"))]
28#[allow(unreachable_pub)]
29mod win_bindings;
30
31#[cfg(all(
32 not(unix),
33 not(windows),
34 not(all(
35 target_arch = "wasm32",
36 feature = "wasmbind",
37 not(any(target_os = "emscripten", target_os = "wasi"))
38 ))
39))]
40mod inner {
41 use crate::{FixedOffset, MappedLocalTime, NaiveDateTime};
42
43 pub(super) fn offset_from_utc_datetime(
44 _utc_time: &NaiveDateTime,
45 ) -> MappedLocalTime<FixedOffset> {
46 MappedLocalTime::Single(FixedOffset::east_opt(0).unwrap())
47 }
48
49 pub(super) fn offset_from_local_datetime(
50 _local_time: &NaiveDateTime,
51 ) -> MappedLocalTime<FixedOffset> {
52 MappedLocalTime::Single(FixedOffset::east_opt(0).unwrap())
53 }
54}
55
56#[cfg(all(
57 target_arch = "wasm32",
58 feature = "wasmbind",
59 not(any(target_os = "emscripten", target_os = "wasi"))
60))]
61mod inner {
62 use crate::{Datelike, FixedOffset, MappedLocalTime, NaiveDateTime, Timelike};
63
64 pub(super) fn offset_from_utc_datetime(utc: &NaiveDateTime) -> MappedLocalTime<FixedOffset> {
65 let offset = js_sys::Date::from(utc.and_utc()).get_timezone_offset();
66 MappedLocalTime::Single(FixedOffset::west_opt((offset as i32) * 60).unwrap())
67 }
68
69 pub(super) fn offset_from_local_datetime(
70 local: &NaiveDateTime,
71 ) -> MappedLocalTime<FixedOffset> {
72 let mut year = local.year();
73 if year < 100 {
74 // The API in `js_sys` does not let us create a `Date` with negative years.
75 // And values for years from `0` to `99` map to the years `1900` to `1999`.
76 // Shift the value by a multiple of 400 years until it is `>= 100`.
77 let shift_cycles = (year - 100).div_euclid(400);
78 year -= shift_cycles * 400;
79 }
80 let js_date = js_sys::Date::new_with_year_month_day_hr_min_sec(
81 year as u32,
82 local.month0() as i32,
83 local.day() as i32,
84 local.hour() as i32,
85 local.minute() as i32,
86 local.second() as i32,
87 // ignore milliseconds, our representation of leap seconds may be problematic
88 );
89 let offset = js_date.get_timezone_offset();
90 // We always get a result, even if this time does not exist or is ambiguous.
91 MappedLocalTime::Single(FixedOffset::west_opt((offset as i32) * 60).unwrap())
92 }
93}
94
95#[cfg(unix)]
96mod tz_info;
97
98/// The local timescale.
99///
100/// Using the [`TimeZone`](./trait.TimeZone.html) methods
101/// on the Local struct is the preferred way to construct `DateTime<Local>`
102/// instances.
103///
104/// # Example
105///
106/// ```
107/// use chrono::{DateTime, Local, TimeZone};
108///
109/// let dt1: DateTime<Local> = Local::now();
110/// let dt2: DateTime<Local> = Local.timestamp_opt(0, 0).unwrap();
111/// assert!(dt1 >= dt2);
112/// ```
113#[derive(Copy, Clone, Debug)]
114#[cfg_attr(
115 any(feature = "rkyv", feature = "rkyv-16", feature = "rkyv-32", feature = "rkyv-64"),
116 derive(Archive, Deserialize, Serialize),
117 archive(compare(PartialEq)),
118 archive_attr(derive(Clone, Copy, Debug))
119)]
120#[cfg_attr(feature = "rkyv-validation", archive(check_bytes))]
121#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
122pub struct Local;
123
124impl Local {
125 /// Returns a `Date` which corresponds to the current date.
126 #[deprecated(since = "0.4.23", note = "use `Local::now()` instead")]
127 #[allow(deprecated)]
128 #[must_use]
129 pub fn today() -> Date<Local> {
130 Local::now().date()
131 }
132
133 /// Returns a `DateTime<Local>` which corresponds to the current date, time and offset from
134 /// UTC.
135 ///
136 /// See also the similar [`Utc::now()`] which returns `DateTime<Utc>`, i.e. without the local
137 /// offset.
138 ///
139 /// # Example
140 ///
141 /// ```
142 /// # #![allow(unused_variables)]
143 /// # use chrono::{DateTime, FixedOffset, Local};
144 /// // Current local time
145 /// let now = Local::now();
146 ///
147 /// // Current local date
148 /// let today = now.date_naive();
149 ///
150 /// // Current local time, converted to `DateTime<FixedOffset>`
151 /// let now_fixed_offset = Local::now().fixed_offset();
152 /// // or
153 /// let now_fixed_offset: DateTime<FixedOffset> = Local::now().into();
154 ///
155 /// // Current time in some timezone (let's use +05:00)
156 /// // Note that it is usually more efficient to use `Utc::now` for this use case.
157 /// let offset = FixedOffset::east_opt(5 * 60 * 60).unwrap();
158 /// let now_with_offset = Local::now().with_timezone(&offset);
159 /// ```
160 pub fn now() -> DateTime<Local> {
161 Utc::now().with_timezone(&Local)
162 }
163}
164
165impl TimeZone for Local {
166 type Offset = FixedOffset;
167
168 fn from_offset(_offset: &FixedOffset) -> Local {
169 Local
170 }
171
172 #[allow(deprecated)]
173 fn offset_from_local_date(&self, local: &NaiveDate) -> MappedLocalTime<FixedOffset> {
174 // Get the offset at local midnight.
175 self.offset_from_local_datetime(&local.and_time(NaiveTime::MIN))
176 }
177
178 fn offset_from_local_datetime(&self, local: &NaiveDateTime) -> MappedLocalTime<FixedOffset> {
179 inner::offset_from_local_datetime(local)
180 }
181
182 #[allow(deprecated)]
183 fn offset_from_utc_date(&self, utc: &NaiveDate) -> FixedOffset {
184 // Get the offset at midnight.
185 self.offset_from_utc_datetime(&utc.and_time(NaiveTime::MIN))
186 }
187
188 fn offset_from_utc_datetime(&self, utc: &NaiveDateTime) -> FixedOffset {
189 inner::offset_from_utc_datetime(utc).unwrap()
190 }
191}
192
193#[cfg(windows)]
194#[derive(Copy, Clone, Eq, PartialEq)]
195struct Transition {
196 transition_utc: NaiveDateTime,
197 offset_before: FixedOffset,
198 offset_after: FixedOffset,
199}
200
201#[cfg(windows)]
202impl Transition {
203 fn new(
204 transition_local: NaiveDateTime,
205 offset_before: FixedOffset,
206 offset_after: FixedOffset,
207 ) -> Transition {
208 // It is no problem if the transition time in UTC falls a couple of hours inside the buffer
209 // space around the `NaiveDateTime` range (although it is very theoretical to have a
210 // transition at midnight around `NaiveDate::(MIN|MAX)`.
211 let transition_utc = transition_local.overflowing_sub_offset(offset_before);
212 Transition { transition_utc, offset_before, offset_after }
213 }
214}
215
216#[cfg(windows)]
217impl PartialOrd for Transition {
218 fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
219 Some(self.transition_utc.cmp(&other.transition_utc))
220 }
221}
222
223#[cfg(windows)]
224impl Ord for Transition {
225 fn cmp(&self, other: &Self) -> Ordering {
226 self.transition_utc.cmp(&other.transition_utc)
227 }
228}
229
230// Calculate the time in UTC given a local time and transitions.
231// `transitions` must be sorted.
232#[cfg(windows)]
233fn lookup_with_dst_transitions(
234 transitions: &[Transition],
235 dt: NaiveDateTime,
236) -> MappedLocalTime<FixedOffset> {
237 for t in transitions.iter() {
238 // A transition can result in the wall clock time going forward (creating a gap) or going
239 // backward (creating a fold). We are interested in the earliest and latest wall time of the
240 // transition, as this are the times between which `dt` does may not exist or is ambiguous.
241 //
242 // It is no problem if the transition times falls a couple of hours inside the buffer
243 // space around the `NaiveDateTime` range (although it is very theoretical to have a
244 // transition at midnight around `NaiveDate::(MIN|MAX)`.
245 let (offset_min, offset_max) =
246 match t.offset_after.local_minus_utc() > t.offset_before.local_minus_utc() {
247 true => (t.offset_before, t.offset_after),
248 false => (t.offset_after, t.offset_before),
249 };
250 let wall_earliest = t.transition_utc.overflowing_add_offset(offset_min);
251 let wall_latest = t.transition_utc.overflowing_add_offset(offset_max);
252
253 if dt < wall_earliest {
254 return MappedLocalTime::Single(t.offset_before);
255 } else if dt <= wall_latest {
256 return match t.offset_after.local_minus_utc().cmp(&t.offset_before.local_minus_utc()) {
257 Ordering::Equal => MappedLocalTime::Single(t.offset_before),
258 Ordering::Less => MappedLocalTime::Ambiguous(t.offset_before, t.offset_after),
259 Ordering::Greater => {
260 if dt == wall_earliest {
261 MappedLocalTime::Single(t.offset_before)
262 } else if dt == wall_latest {
263 MappedLocalTime::Single(t.offset_after)
264 } else {
265 MappedLocalTime::None
266 }
267 }
268 };
269 }
270 }
271 MappedLocalTime::Single(transitions.last().unwrap().offset_after)
272}
273
274#[cfg(test)]
275mod tests {
276 use super::Local;
277 use crate::offset::TimeZone;
278 #[cfg(windows)]
279 use crate::offset::local::{Transition, lookup_with_dst_transitions};
280 use crate::{Datelike, Days, Utc};
281 #[cfg(windows)]
282 use crate::{FixedOffset, MappedLocalTime, NaiveDate, NaiveDateTime};
283
284 #[test]
285 fn verify_correct_offsets() {
286 let now = Local::now();
287 let from_local = Local.from_local_datetime(&now.naive_local()).unwrap();
288 let from_utc = Local.from_utc_datetime(&now.naive_utc());
289
290 assert_eq!(now.offset().local_minus_utc(), from_local.offset().local_minus_utc());
291 assert_eq!(now.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
292
293 assert_eq!(now, from_local);
294 assert_eq!(now, from_utc);
295 }
296
297 #[test]
298 fn verify_correct_offsets_distant_past() {
299 let distant_past = Local::now() - Days::new(365 * 500);
300 let from_local = Local.from_local_datetime(&distant_past.naive_local()).unwrap();
301 let from_utc = Local.from_utc_datetime(&distant_past.naive_utc());
302
303 assert_eq!(distant_past.offset().local_minus_utc(), from_local.offset().local_minus_utc());
304 assert_eq!(distant_past.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
305
306 assert_eq!(distant_past, from_local);
307 assert_eq!(distant_past, from_utc);
308 }
309
310 #[test]
311 fn verify_correct_offsets_distant_future() {
312 let distant_future = Local::now() + Days::new(365 * 35000);
313 let from_local = Local.from_local_datetime(&distant_future.naive_local()).unwrap();
314 let from_utc = Local.from_utc_datetime(&distant_future.naive_utc());
315
316 assert_eq!(
317 distant_future.offset().local_minus_utc(),
318 from_local.offset().local_minus_utc()
319 );
320 assert_eq!(distant_future.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
321
322 assert_eq!(distant_future, from_local);
323 assert_eq!(distant_future, from_utc);
324 }
325
326 #[test]
327 fn test_local_date_sanity_check() {
328 // issue #27
329 assert_eq!(Local.with_ymd_and_hms(2999, 12, 28, 0, 0, 0).unwrap().day(), 28);
330 }
331
332 #[test]
333 fn test_leap_second() {
334 // issue #123
335 let today = Utc::now().date_naive();
336
337 if let Some(dt) = today.and_hms_milli_opt(15, 2, 59, 1000) {
338 let timestr = dt.time().to_string();
339 // the OS API may or may not support the leap second,
340 // but there are only two sensible options.
341 assert!(
342 timestr == "15:02:60" || timestr == "15:03:00",
343 "unexpected timestr {:?}",
344 timestr
345 );
346 }
347
348 if let Some(dt) = today.and_hms_milli_opt(15, 2, 3, 1234) {
349 let timestr = dt.time().to_string();
350 assert!(
351 timestr == "15:02:03.234" || timestr == "15:02:04.234",
352 "unexpected timestr {:?}",
353 timestr
354 );
355 }
356 }
357
358 #[test]
359 #[cfg(windows)]
360 fn test_lookup_with_dst_transitions() {
361 let ymdhms = |y, m, d, h, n, s| {
362 NaiveDate::from_ymd_opt(y, m, d).unwrap().and_hms_opt(h, n, s).unwrap()
363 };
364
365 #[track_caller]
366 #[allow(clippy::too_many_arguments)]
367 fn compare_lookup(
368 transitions: &[Transition],
369 y: i32,
370 m: u32,
371 d: u32,
372 h: u32,
373 n: u32,
374 s: u32,
375 result: MappedLocalTime<FixedOffset>,
376 ) {
377 let dt = NaiveDate::from_ymd_opt(y, m, d).unwrap().and_hms_opt(h, n, s).unwrap();
378 assert_eq!(lookup_with_dst_transitions(transitions, dt), result);
379 }
380
381 // dst transition before std transition
382 // dst offset > std offset
383 let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
384 let dst = FixedOffset::east_opt(4 * 60 * 60).unwrap();
385 let transitions = [
386 Transition::new(ymdhms(2023, 3, 26, 2, 0, 0), std, dst),
387 Transition::new(ymdhms(2023, 10, 29, 3, 0, 0), dst, std),
388 ];
389 compare_lookup(&transitions, 2023, 3, 26, 1, 0, 0, MappedLocalTime::Single(std));
390 compare_lookup(&transitions, 2023, 3, 26, 2, 0, 0, MappedLocalTime::Single(std));
391 compare_lookup(&transitions, 2023, 3, 26, 2, 30, 0, MappedLocalTime::None);
392 compare_lookup(&transitions, 2023, 3, 26, 3, 0, 0, MappedLocalTime::Single(dst));
393 compare_lookup(&transitions, 2023, 3, 26, 4, 0, 0, MappedLocalTime::Single(dst));
394
395 compare_lookup(&transitions, 2023, 10, 29, 1, 0, 0, MappedLocalTime::Single(dst));
396 compare_lookup(&transitions, 2023, 10, 29, 2, 0, 0, MappedLocalTime::Ambiguous(dst, std));
397 compare_lookup(&transitions, 2023, 10, 29, 2, 30, 0, MappedLocalTime::Ambiguous(dst, std));
398 compare_lookup(&transitions, 2023, 10, 29, 3, 0, 0, MappedLocalTime::Ambiguous(dst, std));
399 compare_lookup(&transitions, 2023, 10, 29, 4, 0, 0, MappedLocalTime::Single(std));
400
401 // std transition before dst transition
402 // dst offset > std offset
403 let std = FixedOffset::east_opt(-5 * 60 * 60).unwrap();
404 let dst = FixedOffset::east_opt(-4 * 60 * 60).unwrap();
405 let transitions = [
406 Transition::new(ymdhms(2023, 3, 24, 3, 0, 0), dst, std),
407 Transition::new(ymdhms(2023, 10, 27, 2, 0, 0), std, dst),
408 ];
409 compare_lookup(&transitions, 2023, 3, 24, 1, 0, 0, MappedLocalTime::Single(dst));
410 compare_lookup(&transitions, 2023, 3, 24, 2, 0, 0, MappedLocalTime::Ambiguous(dst, std));
411 compare_lookup(&transitions, 2023, 3, 24, 2, 30, 0, MappedLocalTime::Ambiguous(dst, std));
412 compare_lookup(&transitions, 2023, 3, 24, 3, 0, 0, MappedLocalTime::Ambiguous(dst, std));
413 compare_lookup(&transitions, 2023, 3, 24, 4, 0, 0, MappedLocalTime::Single(std));
414
415 compare_lookup(&transitions, 2023, 10, 27, 1, 0, 0, MappedLocalTime::Single(std));
416 compare_lookup(&transitions, 2023, 10, 27, 2, 0, 0, MappedLocalTime::Single(std));
417 compare_lookup(&transitions, 2023, 10, 27, 2, 30, 0, MappedLocalTime::None);
418 compare_lookup(&transitions, 2023, 10, 27, 3, 0, 0, MappedLocalTime::Single(dst));
419 compare_lookup(&transitions, 2023, 10, 27, 4, 0, 0, MappedLocalTime::Single(dst));
420
421 // dst transition before std transition
422 // dst offset < std offset
423 let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
424 let dst = FixedOffset::east_opt((2 * 60 + 30) * 60).unwrap();
425 let transitions = [
426 Transition::new(ymdhms(2023, 3, 26, 2, 30, 0), std, dst),
427 Transition::new(ymdhms(2023, 10, 29, 2, 0, 0), dst, std),
428 ];
429 compare_lookup(&transitions, 2023, 3, 26, 1, 0, 0, MappedLocalTime::Single(std));
430 compare_lookup(&transitions, 2023, 3, 26, 2, 0, 0, MappedLocalTime::Ambiguous(std, dst));
431 compare_lookup(&transitions, 2023, 3, 26, 2, 15, 0, MappedLocalTime::Ambiguous(std, dst));
432 compare_lookup(&transitions, 2023, 3, 26, 2, 30, 0, MappedLocalTime::Ambiguous(std, dst));
433 compare_lookup(&transitions, 2023, 3, 26, 3, 0, 0, MappedLocalTime::Single(dst));
434
435 compare_lookup(&transitions, 2023, 10, 29, 1, 0, 0, MappedLocalTime::Single(dst));
436 compare_lookup(&transitions, 2023, 10, 29, 2, 0, 0, MappedLocalTime::Single(dst));
437 compare_lookup(&transitions, 2023, 10, 29, 2, 15, 0, MappedLocalTime::None);
438 compare_lookup(&transitions, 2023, 10, 29, 2, 30, 0, MappedLocalTime::Single(std));
439 compare_lookup(&transitions, 2023, 10, 29, 3, 0, 0, MappedLocalTime::Single(std));
440
441 // std transition before dst transition
442 // dst offset < std offset
443 let std = FixedOffset::east_opt(-(4 * 60 + 30) * 60).unwrap();
444 let dst = FixedOffset::east_opt(-5 * 60 * 60).unwrap();
445 let transitions = [
446 Transition::new(ymdhms(2023, 3, 24, 2, 0, 0), dst, std),
447 Transition::new(ymdhms(2023, 10, 27, 2, 30, 0), std, dst),
448 ];
449 compare_lookup(&transitions, 2023, 3, 24, 1, 0, 0, MappedLocalTime::Single(dst));
450 compare_lookup(&transitions, 2023, 3, 24, 2, 0, 0, MappedLocalTime::Single(dst));
451 compare_lookup(&transitions, 2023, 3, 24, 2, 15, 0, MappedLocalTime::None);
452 compare_lookup(&transitions, 2023, 3, 24, 2, 30, 0, MappedLocalTime::Single(std));
453 compare_lookup(&transitions, 2023, 3, 24, 3, 0, 0, MappedLocalTime::Single(std));
454
455 compare_lookup(&transitions, 2023, 10, 27, 1, 0, 0, MappedLocalTime::Single(std));
456 compare_lookup(&transitions, 2023, 10, 27, 2, 0, 0, MappedLocalTime::Ambiguous(std, dst));
457 compare_lookup(&transitions, 2023, 10, 27, 2, 15, 0, MappedLocalTime::Ambiguous(std, dst));
458 compare_lookup(&transitions, 2023, 10, 27, 2, 30, 0, MappedLocalTime::Ambiguous(std, dst));
459 compare_lookup(&transitions, 2023, 10, 27, 3, 0, 0, MappedLocalTime::Single(dst));
460
461 // offset stays the same
462 let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
463 let transitions = [
464 Transition::new(ymdhms(2023, 3, 26, 2, 0, 0), std, std),
465 Transition::new(ymdhms(2023, 10, 29, 3, 0, 0), std, std),
466 ];
467 compare_lookup(&transitions, 2023, 3, 26, 2, 0, 0, MappedLocalTime::Single(std));
468 compare_lookup(&transitions, 2023, 10, 29, 3, 0, 0, MappedLocalTime::Single(std));
469
470 // single transition
471 let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
472 let dst = FixedOffset::east_opt(4 * 60 * 60).unwrap();
473 let transitions = [Transition::new(ymdhms(2023, 3, 26, 2, 0, 0), std, dst)];
474 compare_lookup(&transitions, 2023, 3, 26, 1, 0, 0, MappedLocalTime::Single(std));
475 compare_lookup(&transitions, 2023, 3, 26, 2, 0, 0, MappedLocalTime::Single(std));
476 compare_lookup(&transitions, 2023, 3, 26, 2, 30, 0, MappedLocalTime::None);
477 compare_lookup(&transitions, 2023, 3, 26, 3, 0, 0, MappedLocalTime::Single(dst));
478 compare_lookup(&transitions, 2023, 3, 26, 4, 0, 0, MappedLocalTime::Single(dst));
479 }
480
481 #[test]
482 #[cfg(windows)]
483 fn test_lookup_with_dst_transitions_limits() {
484 // Transition beyond UTC year end doesn't panic in year of `NaiveDate::MAX`
485 let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
486 let dst = FixedOffset::east_opt(4 * 60 * 60).unwrap();
487 let transitions = [
488 Transition::new(NaiveDateTime::MAX.with_month(7).unwrap(), std, dst),
489 Transition::new(NaiveDateTime::MAX, dst, std),
490 ];
491 assert_eq!(
492 lookup_with_dst_transitions(&transitions, NaiveDateTime::MAX.with_month(3).unwrap()),
493 MappedLocalTime::Single(std)
494 );
495 assert_eq!(
496 lookup_with_dst_transitions(&transitions, NaiveDateTime::MAX.with_month(8).unwrap()),
497 MappedLocalTime::Single(dst)
498 );
499 // Doesn't panic with `NaiveDateTime::MAX` as argument (which would be out of range when
500 // converted to UTC).
501 assert_eq!(
502 lookup_with_dst_transitions(&transitions, NaiveDateTime::MAX),
503 MappedLocalTime::Ambiguous(dst, std)
504 );
505
506 // Transition before UTC year end doesn't panic in year of `NaiveDate::MIN`
507 let std = FixedOffset::west_opt(3 * 60 * 60).unwrap();
508 let dst = FixedOffset::west_opt(4 * 60 * 60).unwrap();
509 let transitions = [
510 Transition::new(NaiveDateTime::MIN, std, dst),
511 Transition::new(NaiveDateTime::MIN.with_month(6).unwrap(), dst, std),
512 ];
513 assert_eq!(
514 lookup_with_dst_transitions(&transitions, NaiveDateTime::MIN.with_month(3).unwrap()),
515 MappedLocalTime::Single(dst)
516 );
517 assert_eq!(
518 lookup_with_dst_transitions(&transitions, NaiveDateTime::MIN.with_month(8).unwrap()),
519 MappedLocalTime::Single(std)
520 );
521 // Doesn't panic with `NaiveDateTime::MIN` as argument (which would be out of range when
522 // converted to UTC).
523 assert_eq!(
524 lookup_with_dst_transitions(&transitions, NaiveDateTime::MIN),
525 MappedLocalTime::Ambiguous(std, dst)
526 );
527 }
528
529 #[test]
530 #[cfg(feature = "rkyv-validation")]
531 fn test_rkyv_validation() {
532 let local = Local;
533 // Local is a ZST and serializes to 0 bytes
534 let bytes = rkyv::to_bytes::<_, 0>(&local).unwrap();
535 assert_eq!(bytes.len(), 0);
536
537 // but is deserialized to an archived variant without a
538 // wrapping object
539 assert_eq!(rkyv::from_bytes::<Local>(&bytes).unwrap(), super::ArchivedLocal);
540 }
541}
542