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 Sync for Position

impl Sync for __m128i

impl Sync for __m256d

impl Sync for __m128d

impl Sync for CpuidResult

impl Sync for __m256

impl Sync for __m64

impl Sync for __m128

impl Sync for __m256i

Implementors

impl !Sync for Args
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impl !Sync for ArgsOs
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impl !Sync for LocalWaker
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impl Sync for AtomicBool
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impl Sync for AtomicI16
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impl Sync for AtomicI32
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impl Sync for AtomicI64
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impl Sync for AtomicI8
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impl Sync for AtomicIsize
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impl Sync for AtomicU16
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impl Sync for AtomicU32
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impl Sync for AtomicU64
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impl Sync for AtomicU8
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impl Sync for AtomicUsize
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impl Sync for std::sync::Once
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impl Sync for Waker
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impl<'_, T> Sync for std::slice::Iter<'_, T> where
    T: Sync
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impl<'_, T> Sync for std::slice::IterMut<'_, T> where
    T: Sync
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impl<'a> Sync for std::string::Drain<'a>
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impl<'a, T> Sync for std::collections::linked_list::Iter<'a, T> where
    T: Sync
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impl<'a, T> Sync for std::collections::linked_list::IterMut<'a, T> where
    T: Sync
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impl<'a, T> Sync for std::collections::vec_deque::Drain<'a, T> where
    T: Sync
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impl<'a, T> Sync for std::vec::Drain<'a, T> where
    T: Sync
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impl<'a, T: ?Sized + Sync> Sync for MutexGuard<'a, T>
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impl<'a, T: ?Sized + Sync> Sync for RwLockReadGuard<'a, T>
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impl<'a, T: ?Sized + Sync> Sync for RwLockWriteGuard<'a, T>
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impl<T> !Sync for *const T where
    T: ?Sized
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impl<T> !Sync for *mut T where
    T: ?Sized
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impl<T> !Sync for Cell<T> where
    T: ?Sized
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impl<T> !Sync for RefCell<T> where
    T: ?Sized
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impl<T> !Sync for UnsafeCell<T> where
    T: ?Sized
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impl<T> !Sync for NonNull<T> where
    T: ?Sized
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NonNull pointers are not Sync because the data they reference may be aliased.

impl<T> !Sync for Rc<T> where
    T: ?Sized
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impl<T> !Sync for std::rc::Weak<T> where
    T: ?Sized
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impl<T> !Sync for Receiver<T>
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impl<T> !Sync for Sender<T>
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impl<T> Sync for LinkedList<T> where
    T: Sync
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impl<T> Sync for AtomicPtr<T>
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impl<T> Sync for Arc<T> where
    T: Send + Sync + ?Sized
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impl<T> Sync for std::sync::Weak<T> where
    T: Send + Sync + ?Sized
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impl<T> Sync for JoinHandle<T>
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impl<T> Sync for std::vec::IntoIter<T> where
    T: Sync
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impl<T: ?Sized + Send + Sync> Sync for RwLock<T>
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impl<T: ?Sized + Send> Sync for Mutex<T>
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Auto implementors

impl !Sync for Excess

impl !Sync for Vars

impl !Sync for VarsOs

impl !Sync for Command

impl !Sync for TraitObject

impl !Sync for Select

impl Sync for std::cmp::Ordering

impl Sync for CollectionAllocErr

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 SearchStep

impl Sync for ParseError

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

impl Sync for RecvTimeoutError

impl Sync for TryRecvError

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 str

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 std::ascii::EscapeDefault

impl Sync for BorrowError

impl Sync for BorrowMutError

impl Sync for CharTryFromError

impl Sync for DecodeUtf16Error

impl Sync for EscapeDebug

impl Sync for std::char::EscapeDefault

impl Sync for 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 Pinned

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 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 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 Arguments<'a>

impl<'a> !Sync for Formatter<'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::Lines<'a>

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

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

impl<'a> Sync for SplitWhitespace<'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, 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 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::hash_map::Entry<'a, K, V>

impl<'a, K, V> !Sync for std::collections::hash_map::OccupiedEntry<'a, K, V>

impl<'a, K, V> !Sync for std::collections::hash_map::VacantEntry<'a, K, V>

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::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::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, 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::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 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<'rx, T> !Sync for Handle<'rx, T>

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 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 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 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 BTreeMap<K, V> where
    K: Sync,
    V: 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, 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 Reverse<T> where
    T: Sync

impl<T> Sync for BinaryHeap<T> where
    T: Sync

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

impl<T> Sync for BTreeSet<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 std::collections::vec_deque::IntoIter<T> where
    T: Sync

impl<T> Sync for VecDeque<T> where
    T: Sync

impl<T> Sync for Cursor<T> where
    T: Sync

impl<T> Sync for std::io::Take<T> where
    T: Sync

impl<T> Sync for std::iter::Empty<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, 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