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

    pub unsafe auto trait Sync { }

Expand description

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` and `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`. 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

## Implementors

1.26.0[src]

### impl !Sync for Args

1.26.0[src]

### impl !Sync for ArgsOs

[src]

### impl Sync for BorrowedHandle<'_>

This is supported on Windows only.
[src]

### impl Sync for HandleOrInvalid

This is supported on Windows only.
[src]

### impl Sync for OwnedHandle

This is supported on Windows only.
[src]

### impl Sync for AtomicBool

1.34.0[src]

### impl Sync for AtomicI8

1.34.0[src]

### impl Sync for AtomicI16

1.34.0[src]

### impl Sync for AtomicI32

1.34.0[src]

### impl Sync for AtomicI64

[src]

### impl Sync for AtomicIsize

1.34.0[src]

### impl Sync for AtomicU8

1.34.0[src]

### impl Sync for AtomicU16

1.34.0[src]

### impl Sync for AtomicU32

1.34.0[src]

### impl Sync for AtomicU64

[src]

### impl Sync for AtomicUsize

[src]

### impl Sync for std::sync::Once

1.36.0[src]

### impl Sync for Waker

1.6.0[src]

### impl<'_> Sync for std::string::Drain<'_>

[src]

### impl<'_, T> Sync for std::collections::linked_list::Cursor<'_, T> where
T: Sync,

[src]

### impl<'_, T> Sync for CursorMut<'_, T> where
T: Sync,

[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::IterMut<'_, 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,

1.6.0[src]

### impl<'_, T, A> Sync for std::collections::vec_deque::Drain<'_, T, A> where
T: Sync,
A: Allocator + Sync,

1.6.0[src]

### impl<'_, T, A> Sync for std::vec::Drain<'_, T, A> where
T: Sync,
A: Sync + Allocator,

1.44.0[src]

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

1.44.0[src]

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

[src]

### impl<Dyn> Sync for DynMetadata<Dyn> where
Dyn: ?Sized,

[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,

1.25.0[src]

### impl<T> !Sync for NonNull<T> where
T: ?Sized,

[src]

### impl<T> !Sync for Rc<T> where
T: ?Sized,

1.4.0[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,

1.42.0[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: Sync + Send + ?Sized,

1.4.0[src]

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

1.29.0[src]

### impl<T> Sync for JoinHandle<T>

[src]

### impl<T, A> Sync for std::vec::IntoIter<T, A> where
T: Sync,
A: Allocator,

[src]

### impl<T, F: Send> Sync for SyncLazy<T, F> where
SyncOnceCell<T>: Sync,

[src]

### impl<T: Sync + Send> Sync for SyncOnceCell<T>

[src]

### impl<T: ?Sized + Send + Sync> Sync for RwLock<T>

[src]

### impl<T: ?Sized + Send> Sync for Mutex<T>

1.19.0[src]

### impl<T: ?Sized + Sync> Sync for MutexGuard<'_, T>

1.23.0[src]

### impl<T: ?Sized + Sync> Sync for RwLockReadGuard<'_, T>

1.23.0[src]

### impl<T: ?Sized + Sync> Sync for RwLockWriteGuard<'_, T>

## Auto implementors

### impl !Sync for Vars

### impl !Sync for VarsOs

### impl !Sync for OnceState

### impl !Sync for RawWaker

### impl Sync for BacktraceStatus

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

### impl Sync for TryReserveErrorKind

### 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 AncillaryError

### 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 i8

### impl Sync for i16

### impl Sync for i32

### impl Sync for i64

### impl Sync for i128

### impl Sync for isize

### impl Sync for [u8]

### impl Sync for str

### impl Sync for u8

### impl Sync for u16

### impl Sync for u32

### impl Sync for u64

### impl Sync for u128

### impl Sync for usize

### impl Sync for AllocError

### impl Sync for Global

### impl Sync for Layout

### impl Sync for LayoutError

### 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 BacktraceFrame

### 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 DefaultHasher

### impl Sync for RandomState

### impl Sync for TryReserveError

### impl Sync for JoinPathsError

### impl Sync for CStr

### impl Sync for CString

### impl Sync for FromBytesWithNulError

### impl Sync for FromVecWithNulError

### 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 WriterPanicked

### 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 NonZeroI8

### impl Sync for NonZeroI16

### impl Sync for NonZeroI32

### impl Sync for NonZeroI64

### impl Sync for NonZeroI128

### impl Sync for NonZeroIsize

### impl Sync for NonZeroU8

### impl Sync for NonZeroU16

### impl Sync for NonZeroU32

### impl Sync for NonZeroU64

### impl Sync for NonZeroU128

### impl Sync for NonZeroUsize

### impl Sync for ParseFloatError

### impl Sync for ParseIntError

### impl Sync for TryFromIntError

### impl Sync for RangeFull

### impl Sync for PidFd

### impl Sync for stat

### impl Sync for OwnedFd

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

### impl Sync for SocketCred

### impl Sync for UCred

### impl Sync for UnixDatagram

### impl Sync for UnixListener

### impl Sync for UnixStream

### impl Sync for OwnedSocket

### 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 Command

### impl Sync for ExitCode

### impl Sync for ExitStatus

### impl Sync for ExitStatusError

### impl Sync for Output

### impl Sync for Stdio

### impl Sync for ParseBoolError

### impl Sync for Utf8Error

### impl Sync for FromUtf8Error

### impl Sync for FromUtf16Error

### impl Sync for String

### impl Sync for RecvError

### impl Sync for Barrier

### impl Sync for BarrierWaitResult

### impl Sync for Condvar

### 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 Sync for PhantomPinned

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

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

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

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

### impl<'a> Sync for AncillaryData<'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 Messages<'a>

### impl<'a> Sync for ScmCredentials<'a>

### impl<'a> Sync for ScmRights<'a>

### impl<'a> Sync for SocketAncillary<'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 CommandArgs<'a>

### impl<'a> Sync for CommandEnvs<'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: Sync,

### impl<'a, I, A> Sync for Splice<'a, I, A> where
A: Sync,
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, F> Sync for std::collections::hash_set::DrainFilter<'a, K, F> where
F: Sync,
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::OccupiedError<'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::OccupiedError<'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, F> Sync for std::collections::btree_map::DrainFilter<'a, K, V, F> where
F: Sync,
K: Sync,
V: Sync,

### impl<'a, K, V, F> Sync for std::collections::hash_map::DrainFilter<'a, K, V, F> where
F: Sync,
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 RawOccupiedEntryMut<'a, K, V, S> where
K: 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 SplitInclusive<'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::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::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::collections::btree_set::DrainFilter<'a, T, F> where
F: Sync,
T: Sync,

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

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

### impl<'a, T, P> Sync for GroupByMut<'a, T, P> where
P: 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<'a, T, const N: usize> !Sync for ArrayWindows<'a, T, N>

### impl<'a, T, const N: usize> Sync for ArrayChunks<'a, T, N> where
T: Sync,

### impl<'a, T, const N: usize> Sync for ArrayChunksMut<'a, T, N> where
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<'fd> Sync for BorrowedFd<'fd>

### impl<'socket> Sync for BorrowedSocket<'socket>

### 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<B, C> Sync for ControlFlow<B, C> where
B: Sync,
C: Sync,

### impl<F> Sync for PollFn<F> where
F: 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 Intersperse<I> where
I: Sync,
<I as Iterator>::Item: 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> Sync for FromIter<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, G> Sync for IntersperseWith<I, G> where
G: Sync,
I: Sync,
<I as Iterator>::Item: 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::btree_map::IntoKeys<K, V> where
K: Sync,
V: Sync,

### impl<K, V> Sync for std::collections::btree_map::IntoValues<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 std::collections::hash_map::IntoKeys<K, V> where
K: Sync,
V: Sync,

### impl<K, V> Sync for std::collections::hash_map::IntoValues<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 OnceCell<T>

### 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 Pending<T> where
T: Sync,

### impl<T> Sync for Ready<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 Saturating<T> where
T: Sync,

### 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 MaybeUninit<T> where
T: Sync,

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

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

### impl<T, A> Sync for Vec<T, A> where
A: Sync,
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, F = fn() -> T> !Sync for Lazy<T, F>

### 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, const N: usize> Sync for [T; N] where
T: Sync,

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

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

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

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