# Trait std::marker::Sync

1.0.0 · source ·

    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.

A shorter overview of how `Sync` and `Send` relate to referencing:

- `&T` is `Send` if and only if `T` is `Sync`
- `&mut T` is `Send` if and only if `T` is `Send`
- `&T` and `&mut T` are `Sync` if and only if `T` is `Sync`

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`.

## Implementors§

1.26.0 · source§

### impl !Sync for Args

1.26.0 · source§

### impl !Sync for ArgsOs

1.63.0 · source§

### impl Sync for BorrowedHandle<'_>

Available on Windows only.
1.63.0 · source§

### impl Sync for HandleOrInvalid

Available on Windows only.
1.63.0 · source§

### impl Sync for HandleOrNull

Available on Windows only.
1.63.0 · source§

### impl Sync for OwnedHandle

Available on Windows only.
1.6.0 · source§

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

source§

### impl Sync for AtomicBool

1.34.0 · source§

### impl Sync for AtomicI8

1.34.0 · source§

### impl Sync for AtomicI16

1.34.0 · source§

### impl Sync for AtomicI32

1.34.0 · source§

### impl Sync for AtomicI64

source§

### impl Sync for AtomicIsize

1.34.0 · source§

### impl Sync for AtomicU8

1.34.0 · source§

### impl Sync for AtomicU16

1.34.0 · source§

### impl Sync for AtomicU32

1.34.0 · source§

### impl Sync for AtomicU64

source§

### impl Sync for AtomicUsize

1.36.0 · source§

### impl Sync for Waker

1.44.0 · source§

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

1.44.0 · source§

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

source§

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

source§

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

source§

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

source§

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

1.70.0 · source§

### impl<T> !Sync for OnceCell<T>

source§

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

source§

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

1.25.0 · source§

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

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

source§

### impl<T> !Sync for Receiver<T>

source§

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

`ThinBox<T>` is `Sync` if `T` is `Sync` because the data is owned.

source§

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

source§

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

source§

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

1.31.0 · source§

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

source§

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

source§

### impl<T> Sync for std::slice::Iter<'_, T>where T: Sync,

source§

### impl<T> Sync for std::slice::IterMut<'_, T>where T: Sync,

1.31.0 · source§

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

1.31.0 · source§

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

source§

### impl<T> Sync for AtomicPtr<T>

source§

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

1.29.0 · source§

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

source§

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

1.4.0 · source§

### impl<T, A> !Sync for std::rc::Weak<T, A>where A: Allocator, T: ?Sized,

source§

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

source§

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

source§

### impl<T, A> Sync for LinkedList<T, A>where T: Sync, A: Allocator + Sync,

1.6.0 · source§

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

source§

### impl<T, A> Sync for Arc<T, A>where T: Sync + Send + ?Sized, A: Allocator + Sync,

1.4.0 · source§

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

source§

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

1.6.0 · source§

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

1.72.0 · source§

### impl<T: Send> Sync for Sender<T>

1.70.0 · source§

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

source§

### impl<T: Sync + Send, F: Send> Sync for LazyLock<T, F>

source§

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

source§

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

1.19.0 · source§

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

1.23.0 · source§

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

1.23.0 · source§

### 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 AsciiChar

§

### 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 BacktraceStyle

§

### impl Sync for Which

§

### 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 str

§

### impl Sync for u8

§

### impl Sync for u16

§

### impl Sync for u32

§

### impl Sync for u64

§

### impl Sync for u128

§

### impl Sync for ()

§

### impl Sync for usize

§

### impl Sync for Fallible

§

### impl Sync for Fatal

§

### 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 TryFromCharError

§

### 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 FromBytesUntilNulError

§

### 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 FileTimes

§

### 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 BasicBlock

§

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

§

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

§

### 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 Assume

§

### impl Sync for AddrParseError

§

### impl Sync for IntoIncoming

§

### 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 OwnedFd

§

### impl Sync for PidFd

§

### impl Sync for stat

§

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

§

### impl Sync for SocketCred

§

### impl Sync for UnixDatagram

§

### impl Sync for UnixListener

§

### impl Sync for UnixStream

§

### impl Sync for UCred

§

### impl Sync for InvalidHandleError

§

### impl Sync for NullHandleError

§

### 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 std::ptr::Alignment

§

### 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 std::sync::Once

§

### 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 TryFromFloatSecsError

§

### impl Sync for PhantomPinned

§

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

§

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

§

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

§

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

§

### impl<'a> !Sync for Context<'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 BorrowedCursor<'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 EscapeAscii<'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 Utf8Chunk<'a>

§

### impl<'a> Sync for Utf8Chunks<'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, 'b, const N: usize> Sync for CharArrayRefSearcher<'a, 'b, N>

§

### 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> Sync for ByRefSized<'a, I>where I: 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::ExtractIf<'a, K, F>where F: Sync, K: 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::Cursor<'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::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::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, A> Sync for std::collections::btree_map::Entry<'a, K, V, A>where A: Sync, K: Sync, V: Sync,

§

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

§

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

§

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

§

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

§

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

§

### impl<'a, K, V, F, A> Sync for std::collections::btree_map::ExtractIf<'a, K, V, F, A>where A: Sync, 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, 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::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::Iter<'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 RChunks<'a, T>where T: Sync,

§

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

§

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

§

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

§

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

§

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

§

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

§

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

§

### impl<'a, T, F, A = Global> !Sync for std::collections::linked_list::ExtractIf<'a, T, F, A>

§

### impl<'a, T, F, A> Sync for std::collections::btree_set::ExtractIf<'a, T, F, A>where A: Sync, F: Sync, T: Sync,

§

### impl<'a, T, F, A, FH> Sync for std::vec::ExtractIf<'a, T, F, A, FH>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 std::slice::SplitInclusive<'a, T, P>where P: Sync, T: Sync,

§

### impl<'a, T, P> Sync for SplitInclusiveMut<'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 std::slice::ArrayChunks<'a, T, N>where T: Sync,

§

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

§

### impl<'a, const N: usize> Sync for CharArraySearcher<'a, N>

§

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

§

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

§

### impl<'data> Sync for BorrowedBuf<'data>

§

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

§

### impl<'fd> Sync for BorrowedFd<'fd>

§

### impl<'scope, 'env> Sync for Scope<'scope, 'env>

§

### impl<'scope, T> Sync for ScopedJoinHandle<'scope, T>where T: Send + Sync,

§

### 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<E> Sync for Report<E>where E: 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>

§

### impl<I> Sync for FromIter<I>where I: 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, 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, F, const N: usize> Sync for MapWindows<I, F, N>where F: Sync, I: Sync, <I as Iterator>::Item: 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<I, const N: usize> Sync for std::iter::ArrayChunks<I, N>where I: Sync, <I as Iterator>::Item: 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::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, A> Sync for std::collections::btree_map::IntoIter<K, V, A>where A: Sync, K: Sync, V: Sync,

§

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

§

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

§

### impl<K, V, A> Sync for BTreeMap<K, V, A>where A: Sync, 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 std::io::Bytes<R>where R: Sync,

§

### impl<R: ?Sized> Sync for BufReader<R>where R: Sync,

§

### impl<Ret, T> Sync for fn (T₁, T₂, …, Tₙ) -> Ret

§

### impl<T> !Sync for UniqueRc<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 (T₁, T₂, …, Tₙ)where T: Sync,

§

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

§

### impl<T> Sync for Pending<T>

§

### 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::Empty<T>

§

### 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 Yeet<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 std::collections::binary_heap::IntoIter<T, A>where A: Sync, T: Sync,

§

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

§

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

§

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

§

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

§

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

§

### impl<T, F = fn() -> T> !Sync for LazyCell<T, F>

§

### 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, const LANES: usize> Sync for Mask<T, LANES>where T: 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, const N: usize> Sync for Simd<T, N>where T: Sync,

§

### impl<T, const N: usize> Sync for [MaybeUninit<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 IntoInnerError<W>where W: Sync,

§

### impl<W: ?Sized> Sync for BufWriter<W>where W: Sync,

§

### impl<W: ?Sized> Sync for LineWriter<W>where W: Sync,

§

### impl<Y, R> Sync for CoroutineState<Y, R>where R: Sync, Y: Sync,

§

### impl<const LANES: usize> Sync for LaneCount<LANES>

§

### impl<const N: usize> Sync for [u8; N]