# 1.0.0[−][src]Trait std::marker::Sync

    #[lang = "sync"]
    pub unsafe auto trait Sync { }

Types for which it is safe to share references between threads.

This trait is automatically implemented when the compiler determines it's appropriate.

The precise definition is: a type `T` is `Sync` if and only if `&T` is `Send`. In other words, if there is no possibility of undefined behavior (including data races) when passing `&T` references between threads.

As one would expect, primitive types like `u8` and `f64` are all `Sync`, and so are simple aggregate types containing them, like tuples, structs and enums. More examples of basic `Sync` types include "immutable" types like `&T`, and those with simple inherited mutability, such as `Box<T>`, `Vec<T>` and most other collection types. (Generic parameters need to be `Sync` for their container to be `Sync`.)

A somewhat surprising consequence of the definition is that `&mut T` is `Sync` (if `T` is `Sync`) even though it seems like that might provide unsynchronized mutation. The trick is that a mutable reference behind a shared reference (that is, `& &mut T`) becomes read-only, as if it were a `& &T`. Hence there is no risk of a data race.

Types that are not `Sync` are those that have "interior mutability" in a non-thread-safe form, such as `cell::Cell` and `cell::RefCell`. These types allow for mutation of their contents even through an immutable, shared reference. For example the `set` method on `Cell<T>` takes `&self`, so it requires only a shared reference `&Cell<T>`. The method performs no synchronization, thus `Cell` cannot be `Sync`.

Another example of a non-`Sync` type is the reference-counting pointer `rc::Rc`. Given any reference `&Rc<T>`, you can clone a new `Rc<T>`, modifying the reference counts in a non-atomic way.

For cases when one does need thread-safe interior mutability, Rust provides atomic data types, as well as explicit locking via `sync::Mutex` and `sync::RwLock`. These types ensure that any mutation cannot cause data races, hence the types are `Sync`. Likewise, `sync::Arc` provides a thread-safe analogue of `Rc`.

Any types with interior mutability must also use the `cell::UnsafeCell` wrapper around the value(s) which can be mutated through a shared reference. Failing to doing this is undefined behavior. For example, `transmute`-ing from `&T` to `&mut T` is invalid.

See the Nomicon for more details about `Sync`.

## Implementations on Foreign Types

### `impl Sync for Argument`

### `impl Sync for FormatSpec`

### `impl Sync for Alignment`

### `impl Sync for Count`

### `impl<'_, K, V> Sync for RustcOccupiedEntry<'_, K, V> where
K: Sync,
V: Sync,`

### `impl<'_, K, V, S> Sync for OccupiedEntry<'_, K, V, S> where
K: Sync,
S: Sync,
V: Sync,`

### `impl<'_, K, V> Sync for RawOccupiedEntryMut<'_, K, V> where
K: Sync,
V: Sync,`

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## Implementors

### `impl !Sync for Args`[src]

### `impl !Sync for ArgsOs`[src]

### `impl Sync for AtomicBool`[src]

### `impl Sync for AtomicI16`[src]

### `impl Sync for AtomicI32`[src]

### `impl Sync for AtomicI64`[src]

### `impl Sync for AtomicI8`[src]

### `impl Sync for AtomicIsize`[src]

### `impl Sync for AtomicU16`[src]

### `impl Sync for AtomicU32`[src]

### `impl Sync for AtomicU64`[src]

### `impl Sync for AtomicU8`[src]

### `impl Sync for AtomicUsize`[src]

### `impl Sync for std::sync::Once`[src]

### `impl Sync for Waker`[src]

### `impl<'_> Sync for std::string::Drain<'_>`[src]

### `impl<'_, T> Sync for std::collections::linked_list::Iter<'_, T> where
T: Sync,` [src]

### `impl<'_, T> Sync for std::collections::linked_list::IterMut<'_, T> where
T: Sync,` [src]

### `impl<'_, T> Sync for std::collections::vec_deque::Drain<'_, T> where
T: Sync,` [src]

### `impl<'_, T> Sync for std::slice::Iter<'_, T> where
T: Sync,` [src]

### `impl<'_, T> Sync for std::slice::IterMut<'_, T> where
T: Sync,` [src]

### `impl<'_, T> Sync for std::vec::Drain<'_, T> where
T: Sync,` [src]

### `impl<'_, T: ?Sized + Sync> Sync for MutexGuard<'_, T>`[src]

### `impl<'_, T: ?Sized + Sync> Sync for RwLockReadGuard<'_, T>`[src]

### `impl<'_, T: ?Sized + Sync> Sync for RwLockWriteGuard<'_, T>`[src]

### `impl<T> !Sync for *const T where
T: ?Sized,` [src]

### `impl<T> !Sync for *mut T where
T: ?Sized,` [src]

### `impl<T> !Sync for Cell<T> where
T: ?Sized,` [src]

### `impl<T> !Sync for RefCell<T> where
T: ?Sized,` [src]

### `impl<T> !Sync for UnsafeCell<T> where
T: ?Sized,` [src]

### `impl<T> !Sync for NonNull<T> where
T: ?Sized,` [src]

`NonNull` pointers are not `Sync` because the data they reference may be aliased.

### `impl<T> !Sync for Rc<T> where
T: ?Sized,` [src]

### `impl<T> !Sync for std::rc::Weak<T> where
T: ?Sized,` [src]

### `impl<T> !Sync for Receiver<T>`[src]

### `impl<T> !Sync for Sender<T>`[src]

### `impl<T> Sync for LinkedList<T> where
T: Sync,` [src]

### `impl<T> Sync for std::iter::Empty<T>`[src]

### `impl<T> Sync for AtomicPtr<T>`[src]

### `impl<T> Sync for Arc<T> where
T: Send + Sync + ?Sized,` [src]

### `impl<T> Sync for std::sync::Weak<T> where
T: Send + Sync + ?Sized,` [src]

### `impl<T> Sync for JoinHandle<T>`[src]

### `impl<T> Sync for std::vec::IntoIter<T> where
T: Sync,` [src]

### `impl<T: ?Sized + Send + Sync> Sync for RwLock<T>`[src]

### `impl<T: ?Sized + Send> Sync for Mutex<T>`[src]

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## Auto implementors

### `impl !Sync for Vars`

### `impl !Sync for VarsOs`

### `impl !Sync for Command`

### `impl !Sync for TraitObject`

### `impl !Sync for RawWaker`

### `impl Sync for BacktraceStatus`

### `impl Sync for std::cmp::Ordering`

### `impl Sync for TryReserveError`

### `impl Sync for Infallible`

### `impl Sync for VarError`

### `impl Sync for c_void`

### `impl Sync for std::fmt::Alignment`

### `impl Sync for ErrorKind`

### `impl Sync for SeekFrom`

### `impl Sync for IpAddr`

### `impl Sync for Ipv6MulticastScope`

### `impl Sync for Shutdown`

### `impl Sync for std::net::SocketAddr`

### `impl Sync for FpCategory`

### `impl Sync for IntErrorKind`

### `impl Sync for SearchStep`

### `impl Sync for std::sync::atomic::Ordering`

### `impl Sync for RecvTimeoutError`

### `impl Sync for TryRecvError`

### `impl Sync for bool`

### `impl Sync for char`

### `impl Sync for f32`

### `impl Sync for f64`

### `impl Sync for i128`

### `impl Sync for i16`

### `impl Sync for i32`

### `impl Sync for i64`

### `impl Sync for i8`

### `impl Sync for isize`

### `impl Sync for [u8]`

### `impl Sync for str`

### `impl Sync for u128`

### `impl Sync for u16`

### `impl Sync for u32`

### `impl Sync for u64`

### `impl Sync for u8`

### `impl Sync for usize`

### `impl Sync for AllocErr`

### `impl Sync for CannotReallocInPlace`

### `impl Sync for Global`

### `impl Sync for Layout`

### `impl Sync for LayoutErr`

### `impl Sync for System`

### `impl Sync for TypeId`

### `impl Sync for TryFromSliceError`

### `impl Sync for std::ascii::EscapeDefault`

### `impl Sync for Backtrace`

### `impl Sync for BorrowError`

### `impl Sync for BorrowMutError`

### `impl Sync for CharTryFromError`

### `impl Sync for DecodeUtf16Error`

### `impl Sync for std::char::EscapeDebug`

### `impl Sync for std::char::EscapeDefault`

### `impl Sync for std::char::EscapeUnicode`

### `impl Sync for ParseCharError`

### `impl Sync for ToLowercase`

### `impl Sync for ToUppercase`

### `impl Sync for UnicodeVersion`

### `impl Sync for DefaultHasher`

### `impl Sync for RandomState`

### `impl Sync for JoinPathsError`

### `impl Sync for CStr`

### `impl Sync for CString`

### `impl Sync for FromBytesWithNulError`

### `impl Sync for IntoStringError`

### `impl Sync for NulError`

### `impl Sync for OsStr`

### `impl Sync for OsString`

### `impl Sync for std::fmt::Error`

### `impl Sync for DirBuilder`

### `impl Sync for DirEntry`

### `impl Sync for File`

### `impl Sync for FileType`

### `impl Sync for Metadata`

### `impl Sync for OpenOptions`

### `impl Sync for Permissions`

### `impl Sync for ReadDir`

### `impl Sync for SipHasher`

### `impl Sync for std::io::Empty`

### `impl Sync for std::io::Error`

### `impl Sync for Initializer`

### `impl Sync for std::io::Repeat`

### `impl Sync for Sink`

### `impl Sync for Stderr`

### `impl Sync for Stdin`

### `impl Sync for Stdout`

### `impl Sync for PhantomPinned`

### `impl Sync for AddrParseError`

### `impl Sync for Ipv4Addr`

### `impl Sync for Ipv6Addr`

### `impl Sync for SocketAddrV4`

### `impl Sync for SocketAddrV6`

### `impl Sync for TcpListener`

### `impl Sync for TcpStream`

### `impl Sync for UdpSocket`

### `impl Sync for NonZeroI128`

### `impl Sync for NonZeroI16`

### `impl Sync for NonZeroI32`

### `impl Sync for NonZeroI64`

### `impl Sync for NonZeroI8`

### `impl Sync for NonZeroIsize`

### `impl Sync for NonZeroU128`

### `impl Sync for NonZeroU16`

### `impl Sync for NonZeroU32`

### `impl Sync for NonZeroU64`

### `impl Sync for NonZeroU8`

### `impl Sync for NonZeroUsize`

### `impl Sync for ParseFloatError`

### `impl Sync for ParseIntError`

### `impl Sync for TryFromIntError`

### `impl Sync for RangeFull`

### `impl Sync for NoneError`

### `impl Sync for stat`

### `impl Sync for std::os::unix::net::SocketAddr`

### `impl Sync for UnixDatagram`

### `impl Sync for UnixListener`

### `impl Sync for UnixStream`

### `impl Sync for Path`

### `impl Sync for PathBuf`

### `impl Sync for StripPrefixError`

### `impl Sync for Child`

### `impl Sync for ChildStderr`

### `impl Sync for ChildStdin`

### `impl Sync for ChildStdout`

### `impl Sync for ExitCode`

### `impl Sync for ExitStatus`

### `impl Sync for Output`

### `impl Sync for Stdio`

### `impl Sync for ParseBoolError`

### `impl Sync for Utf8Error`

### `impl Sync for FromUtf16Error`

### `impl Sync for FromUtf8Error`

### `impl Sync for String`

### `impl Sync for RecvError`

### `impl Sync for Barrier`

### `impl Sync for BarrierWaitResult`

### `impl Sync for Condvar`

### `impl Sync for OnceState`

### `impl Sync for WaitTimeoutResult`

### `impl Sync for RawWakerVTable`

### `impl Sync for AccessError`

### `impl Sync for Builder`

### `impl Sync for Thread`

### `impl Sync for ThreadId`

### `impl Sync for Duration`

### `impl Sync for Instant`

### `impl Sync for SystemTime`

### `impl Sync for SystemTimeError`

### `impl<'a> !Sync for std::error::Chain<'a>`

### `impl<'a> !Sync for Arguments<'a>`

### `impl<'a> !Sync for Formatter<'a>`

### `impl<'a> !Sync for IoSlice<'a>`

### `impl<'a> !Sync for IoSliceMut<'a>`

### `impl<'a> !Sync for PanicInfo<'a>`

### `impl<'a> Sync for Component<'a>`

### `impl<'a> Sync for Prefix<'a>`

### `impl<'a> Sync for SplitPaths<'a>`

### `impl<'a> Sync for StderrLock<'a>`

### `impl<'a> Sync for StdinLock<'a>`

### `impl<'a> Sync for StdoutLock<'a>`

### `impl<'a> Sync for std::net::Incoming<'a>`

### `impl<'a> Sync for std::os::unix::net::Incoming<'a>`

### `impl<'a> Sync for EncodeWide<'a>`

### `impl<'a> Sync for Location<'a>`

### `impl<'a> Sync for Ancestors<'a>`

### `impl<'a> Sync for Components<'a>`

### `impl<'a> Sync for Display<'a>`

### `impl<'a> Sync for std::path::Iter<'a>`

### `impl<'a> Sync for PrefixComponent<'a>`

### `impl<'a> Sync for CharSearcher<'a>`

### `impl<'a> Sync for std::str::Bytes<'a>`

### `impl<'a> Sync for CharIndices<'a>`

### `impl<'a> Sync for Chars<'a>`

### `impl<'a> Sync for EncodeUtf16<'a>`

### `impl<'a> Sync for std::str::EscapeDebug<'a>`

### `impl<'a> Sync for std::str::EscapeDefault<'a>`

### `impl<'a> Sync for std::str::EscapeUnicode<'a>`

### `impl<'a> Sync for std::str::Lines<'a>`

### `impl<'a> Sync for LinesAny<'a>`

### `impl<'a> Sync for SplitAsciiWhitespace<'a>`

### `impl<'a> Sync for SplitWhitespace<'a>`

### `impl<'a> Sync for Context<'a>`

### `impl<'a, 'b> !Sync for DebugList<'a, 'b>`

### `impl<'a, 'b> !Sync for DebugMap<'a, 'b>`

### `impl<'a, 'b> !Sync for DebugSet<'a, 'b>`

### `impl<'a, 'b> !Sync for DebugStruct<'a, 'b>`

### `impl<'a, 'b> !Sync for DebugTuple<'a, 'b>`

### `impl<'a, 'b> Sync for CharSliceSearcher<'a, 'b>`

### `impl<'a, 'b> Sync for StrSearcher<'a, 'b>`

### `impl<'a, 'f> !Sync for VaList<'a, 'f>`

### `impl<'a, A> Sync for std::option::Iter<'a, A> where
A: Sync,`

### `impl<'a, A> Sync for std::option::IterMut<'a, A> where
A: Sync,`

### `impl<'a, B: ?Sized> Sync for Cow<'a, B> where
B: Sync,
<B as ToOwned>::Owned: Sync,`

### `impl<'a, F> Sync for CharPredicateSearcher<'a, F> where
F: MultiCharEq + Sync,`

### `impl<'a, I> Sync for Splice<'a, I> where
I: Sync,
<I as Iterator>::Item: Sync,`

### `impl<'a, K> Sync for std::collections::hash_set::Drain<'a, K> where
K: Sync,`

### `impl<'a, K> Sync for std::collections::hash_set::Iter<'a, K> where
K: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::Entry<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::Entry<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::Iter<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::IterMut<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::Keys<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::OccupiedEntry<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::Range<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for RangeMut<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::VacantEntry<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::Values<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::btree_map::ValuesMut<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::Drain<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::Iter<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::IterMut<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::Keys<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::OccupiedEntry<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::RawOccupiedEntryMut<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::VacantEntry<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::Values<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V> Sync for std::collections::hash_map::ValuesMut<'a, K, V> where
K: Sync,
V: Sync,`

### `impl<'a, K, V, S> Sync for RawEntryMut<'a, K, V, S> where
K: Sync,
S: Sync,
V: Sync,`

### `impl<'a, K, V, S> Sync for RawEntryBuilder<'a, K, V, S> where
K: Sync,
S: Sync,
V: Sync,`

### `impl<'a, K, V, S> Sync for RawEntryBuilderMut<'a, K, V, S> where
K: Sync,
S: Sync,
V: Sync,`

### `impl<'a, K, V, S> Sync for RawVacantEntryMut<'a, K, V, S> where
K: Sync,
S: Sync,
V: Sync,`

### `impl<'a, P> Sync for MatchIndices<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for Matches<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for RMatchIndices<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for RMatches<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for std::str::RSplit<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for std::str::RSplitN<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for RSplitTerminator<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for std::str::Split<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for std::str::SplitN<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, P> Sync for SplitTerminator<'a, P> where
<P as Pattern<'a>>::Searcher: Sync,`

### `impl<'a, T> !Sync for std::collections::linked_list::Cursor<'a, T>`

### `impl<'a, T> !Sync for CursorMut<'a, T>`

### `impl<'a, T> !Sync for std::sync::mpsc::Iter<'a, T>`

### `impl<'a, T> !Sync for TryIter<'a, T>`

### `impl<'a, T> Sync for std::collections::binary_heap::Drain<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for DrainSorted<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::binary_heap::Iter<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for PeekMut<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::btree_set::Difference<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::btree_set::Intersection<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::btree_set::Iter<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::btree_set::Range<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::btree_set::SymmetricDifference<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::btree_set::Union<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::vec_deque::Iter<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::collections::vec_deque::IterMut<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::result::Iter<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for std::result::IterMut<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for Chunks<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for ChunksExact<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for ChunksExactMut<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for ChunksMut<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for RChunks<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for RChunksExact<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for RChunksExactMut<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for RChunksMut<'a, T> where
T: Sync,`

### `impl<'a, T> Sync for Windows<'a, T> where
T: Sync,`

### `impl<'a, T, F> !Sync for std::collections::linked_list::DrainFilter<'a, T, F>`

### `impl<'a, T, F> Sync for std::vec::DrainFilter<'a, T, F> where
F: Sync,
T: Sync,`

### `impl<'a, T, P> Sync for std::slice::RSplit<'a, T, P> where
P: Sync,
T: Sync,`

### `impl<'a, T, P> Sync for RSplitMut<'a, T, P> where
P: Sync,
T: Sync,`

### `impl<'a, T, P> Sync for std::slice::RSplitN<'a, T, P> where
P: Sync,
T: Sync,`

### `impl<'a, T, P> Sync for RSplitNMut<'a, T, P> where
P: Sync,
T: Sync,`

### `impl<'a, T, P> Sync for std::slice::Split<'a, T, P> where
P: Sync,
T: Sync,`

### `impl<'a, T, P> Sync for SplitMut<'a, T, P> where
P: Sync,
T: Sync,`

### `impl<'a, T, P> Sync for std::slice::SplitN<'a, T, P> where
P: Sync,
T: Sync,`

### `impl<'a, T, P> Sync for SplitNMut<'a, T, P> where
P: Sync,
T: Sync,`

### `impl<'a, T, S> Sync for std::collections::hash_set::Difference<'a, T, S> where
S: Sync,
T: Sync,`

### `impl<'a, T, S> Sync for std::collections::hash_set::Intersection<'a, T, S> where
S: Sync,
T: Sync,`

### `impl<'a, T, S> Sync for std::collections::hash_set::SymmetricDifference<'a, T, S> where
S: Sync,
T: Sync,`

### `impl<'a, T, S> Sync for std::collections::hash_set::Union<'a, T, S> where
S: Sync,
T: Sync,`

### `impl<'b, T> !Sync for Ref<'b, T>`

### `impl<'b, T> !Sync for RefMut<'b, T>`

### `impl<'f> !Sync for VaListImpl<'f>`

### `impl<A> Sync for std::iter::Repeat<A> where
A: Sync,`

### `impl<A> Sync for std::option::IntoIter<A> where
A: Sync,`

### `impl<A, B> Sync for std::iter::Chain<A, B> where
A: Sync,
B: Sync,`

### `impl<A, B> Sync for Zip<A, B> where
A: Sync,
B: Sync,`

### `impl<B> Sync for std::io::Lines<B> where
B: Sync,`

### `impl<B> Sync for std::io::Split<B> where
B: Sync,`

### `impl<F> Sync for FromFn<F> where
F: Sync,`

### `impl<F> Sync for OnceWith<F> where
F: Sync,`

### `impl<F> Sync for RepeatWith<F> where
F: Sync,`

### `impl<H> Sync for BuildHasherDefault<H> where
H: Sync,`

### `impl<I> Sync for DecodeUtf16<I> where
I: Sync,`

### `impl<I> Sync for Cloned<I> where
I: Sync,`

### `impl<I> Sync for Copied<I> where
I: Sync,`

### `impl<I> Sync for Cycle<I> where
I: Sync,`

### `impl<I> Sync for Enumerate<I> where
I: Sync,`

### `impl<I> Sync for Flatten<I> where
I: Sync,
<<I as Iterator>::Item as IntoIterator>::IntoIter: Sync,`

### `impl<I> Sync for Fuse<I> where
I: Sync,`

### `impl<I> Sync for Peekable<I> where
I: Sync,
<I as Iterator>::Item: Sync,`

### `impl<I> Sync for Skip<I> where
I: Sync,`

### `impl<I> Sync for StepBy<I> where
I: Sync,`

### `impl<I> Sync for std::iter::Take<I> where
I: Sync,`

### `impl<I, F> Sync for FilterMap<I, F> where
F: Sync,
I: Sync,`

### `impl<I, F> Sync for Inspect<I, F> where
F: Sync,
I: Sync,`

### `impl<I, F> Sync for Map<I, F> where
F: Sync,
I: Sync,`

### `impl<I, P> Sync for Filter<I, P> where
I: Sync,
P: Sync,`

### `impl<I, P> Sync for MapWhile<I, P> where
I: Sync,
P: Sync,`

### `impl<I, P> Sync for SkipWhile<I, P> where
I: Sync,
P: Sync,`

### `impl<I, P> Sync for TakeWhile<I, P> where
I: Sync,
P: Sync,`

### `impl<I, St, F> Sync for Scan<I, St, F> where
F: Sync,
I: Sync,
St: Sync,`

### `impl<I, U, F> Sync for FlatMap<I, U, F> where
F: Sync,
I: Sync,
<U as IntoIterator>::IntoIter: Sync,`

### `impl<Idx> Sync for std::ops::Range<Idx> where
Idx: Sync,`

### `impl<Idx> Sync for RangeFrom<Idx> where
Idx: Sync,`

### `impl<Idx> Sync for RangeInclusive<Idx> where
Idx: Sync,`

### `impl<Idx> Sync for RangeTo<Idx> where
Idx: Sync,`

### `impl<Idx> Sync for RangeToInclusive<Idx> where
Idx: Sync,`

### `impl<K> Sync for std::collections::hash_set::IntoIter<K> where
K: Sync,`

### `impl<K, V> Sync for std::collections::btree_map::IntoIter<K, V> where
K: Sync,
V: Sync,`

### `impl<K, V> Sync for std::collections::hash_map::IntoIter<K, V> where
K: Sync,
V: Sync,`

### `impl<K, V> Sync for BTreeMap<K, V> where
K: Sync,
V: Sync,`

### `impl<K, V, S> Sync for HashMap<K, V, S> where
K: Sync,
S: Sync,
V: Sync,`

### `impl<P> Sync for Pin<P> where
P: Sync,`

### `impl<R> Sync for BufReader<R> where
R: Sync,`

### `impl<R> Sync for std::io::Bytes<R> where
R: Sync,`

### `impl<T> !Sync for std::sync::mpsc::IntoIter<T>`

### `impl<T> Sync for Bound<T> where
T: Sync,`

### `impl<T> Sync for Option<T> where
T: Sync,`

### `impl<T> Sync for TryLockError<T> where
T: Sync,`

### `impl<T> Sync for TrySendError<T> where
T: Sync,`

### `impl<T> Sync for Poll<T> where
T: Sync,`

### `impl<T> Sync for [T] where
T: Sync,`

### `impl<T> Sync for Reverse<T> where
T: Sync,`

### `impl<T> Sync for std::collections::binary_heap::IntoIter<T> where
T: Sync,`

### `impl<T> Sync for IntoIterSorted<T> where
T: Sync,`

### `impl<T> Sync for std::collections::btree_set::IntoIter<T> where
T: Sync,`

### `impl<T> Sync for std::collections::linked_list::IntoIter<T> where
T: Sync,`

### `impl<T> Sync for BTreeSet<T> where
T: Sync,`

### `impl<T> Sync for BinaryHeap<T> where
T: Sync,`

### `impl<T> Sync for VecDeque<T> where
T: Sync,`

### `impl<T> Sync for std::collections::vec_deque::IntoIter<T> where
T: Sync,`

### `impl<T> Sync for std::io::Cursor<T> where
T: Sync,`

### `impl<T> Sync for std::io::Take<T> where
T: Sync,`

### `impl<T> Sync for std::iter::Once<T> where
T: Sync,`

### `impl<T> Sync for Rev<T> where
T: Sync,`

### `impl<T> Sync for Discriminant<T>`

### `impl<T> Sync for Wrapping<T> where
T: Sync,`

### `impl<T> Sync for AssertUnwindSafe<T> where
T: Sync,`

### `impl<T> Sync for std::result::IntoIter<T> where
T: Sync,`

### `impl<T> Sync for SendError<T> where
T: Sync,`

### `impl<T> Sync for SyncSender<T> where
T: Send,`

### `impl<T> Sync for PoisonError<T> where
T: Sync,`

### `impl<T> Sync for LocalKey<T>`

### `impl<T> Sync for Vec<T> where
T: Sync,`

### `impl<T> Sync for MaybeUninit<T> where
T: Sync,`

### `impl<T, E> Sync for Result<T, E> where
E: Sync,
T: Sync,`

### `impl<T, F> Sync for Successors<T, F> where
F: Sync,
T: Sync,`

### `impl<T, S> Sync for HashSet<T, S> where
S: Sync,
T: Sync,`

### `impl<T, U> Sync for std::io::Chain<T, U> where
T: Sync,
U: Sync,`

### `impl<T: ?Sized> Sync for Box<T> where
T: Sync,`

### `impl<T: ?Sized> Sync for PhantomData<T> where
T: Sync,`

### `impl<T: ?Sized> Sync for ManuallyDrop<T> where
T: Sync,`

### `impl<W> Sync for BufWriter<W> where
W: Sync,`

### `impl<W> Sync for IntoInnerError<W> where
W: Sync,`

### `impl<W> Sync for LineWriter<W> where
W: Sync,`

### `impl<Y, R> Sync for GeneratorState<Y, R> where
R: Sync,
Y: Sync,`

### `impl<const N: usize, T> Sync for std::array::IntoIter<T, N> where
T: Sync,`

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