Unpin in core::marker - Rust
Description: Types that do not require any pinning guarantees.

## Unpin

# Trait Unpin

1.33.0 · Source

    pub auto trait Unpin { }

Expand description

Types that do not require any pinning guarantees.

For information on what “pinning” is, see the `pin` module documentation.

Implementing the `Unpin` trait for `T` expresses the fact that `T` is pinning-agnostic: it shall not expose nor rely on any pinning guarantees. This, in turn, means that a `Pin`-wrapped pointer to such a type can feature a fully unrestricted API. In other words, if `T: Unpin`, a value of type `T` will not be bound by the invariants which pinning otherwise offers, even when “pinned” by a `Pin<Ptr>` pointing at it. When a value of type `T` is pointed at by a `Pin<Ptr>`, `Pin` will not restrict access to the pointee value like it normally would, thus allowing the user to do anything that they normally could with a non-`Pin`-wrapped `Ptr` to that value.

The idea of this trait is to alleviate the reduced ergonomics of APIs that require the use of `Pin` for soundness for some types, but which also want to be used by other types that don’t care about pinning. The prime example of such an API is `Future::poll`. There are many `Future` types that don’t care about pinning. These futures can implement `Unpin` and therefore get around the pinning related restrictions in the API, while still allowing the subset of `Future`s which do require pinning to be implemented soundly.

For more discussion on the consequences of `Unpin` within the wider scope of the pinning system, see the section about `Unpin` in the `pin` module.

`Unpin` has no consequence at all for non-pinned data. In particular, `mem::replace` happily moves `!Unpin` data, which would be immovable when pinned (`mem::replace` works for any `&mut T`, not just when `T: Unpin`).

However, you cannot use `mem::replace` on `!Unpin` data which is pinned by being wrapped inside a `Pin<Ptr>` pointing at it. This is because you cannot (safely) use a `Pin<Ptr>` to get a `&mut T` to its pointee value, which you would need to call `mem::replace`, and that is what makes this system work.

So this, for example, can only be done on types implementing `Unpin`:

    use std::mem;
    use std::pin::Pin;

    let mut string = "this".to_string();
    let mut pinned_string = Pin::new(&mut string);

    // We need a mutable reference to call `mem::replace`.
    // We can obtain such a reference by (implicitly) invoking `Pin::deref_mut`,
    // but that is only possible because `String` implements `Unpin`.
    mem::replace(&mut *pinned_string, "other".to_string());

This trait is automatically implemented for almost every type. The compiler is free to take the conservative stance of marking types as `Unpin` so long as all of the types that compose its fields are also `Unpin`. This is because if a type implements `Unpin`, then it is unsound for that type’s implementation to rely on pinning-related guarantees for soundness, even when viewed through a “pinning” pointer! It is the responsibility of the implementor of a type that relies upon pinning for soundness to ensure that type is not marked as `Unpin` by adding `PhantomPinned` field. For more details, see the `pin` module docs.

## Implementors§

1.33.0 · Source§

### impl !Unpin for PhantomPinned

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### impl<T: ?Sized> !Unpin for UnsafePinned<T>

When this type is used, that almost certainly means safe APIs need to use pinning to avoid the aliases from becoming invalidated. Therefore let’s mark this as `!Unpin`. You can always opt back in to `Unpin` with an `impl` block, provided your API is still sound while unpinned.

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### impl Unpin for LocalWaker

1.36.0 · Source§

### impl Unpin for Waker

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### impl<Dyn: PointeeSized> Unpin for DynMetadata<Dyn>

1.64.0 · Source§

### impl<F: Unpin> Unpin for PollFn<F>

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### impl<I> Unpin for FromIter<I>

1.48.0 · Source§

### impl<T> Unpin for Ready<T>

1.28.0 · Source§

### impl<T> Unpin for NonZero<T>
where T: ZeroablePrimitive + Unpin,

1.38.0 · Source§

### impl<T: PointeeSized> Unpin for *const T

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### impl<T: PointeeSized> Unpin for *const T is TyPat { hir_id: HirId(DefId(0:11085 ~ core[5cdf]::pat::{impl#3}).12), kind: NotNull, span: library/core/src/pat.rs:87:59: 87:64 (#0) }

1.38.0 · Source§

### impl<T: PointeeSized> Unpin for *mut T

1.33.0 · Source§

### impl<T: PointeeSized> Unpin for &T

1.33.0 · Source§

### impl<T: PointeeSized> Unpin for &mut T

## Auto implementors§

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

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### impl Unpin for AsciiChar

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### impl Unpin for core::cmp::Ordering

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### impl Unpin for Infallible

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### impl Unpin for FromBytesWithNulError

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### impl Unpin for c_void

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### impl Unpin for core::fmt::Alignment

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### impl Unpin for DebugAsHex

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### impl Unpin for Sign

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### impl Unpin for Locality

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### impl Unpin for AtomicOrdering

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### impl Unpin for BasicBlock

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### impl Unpin for UnwindTerminateReason

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### impl Unpin for SimdAlign

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### impl Unpin for TypeKind

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### impl Unpin for IpAddr

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### impl Unpin for Ipv6MulticastScope

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### impl Unpin for SocketAddr

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### impl Unpin for FpCategory

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### impl Unpin for IntErrorKind

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### impl Unpin for OneSidedRangeBound

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### impl Unpin for GetDisjointMutError

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### impl Unpin for SearchStep

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### impl Unpin for core::sync::atomic::Ordering

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### impl Unpin for bool

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### impl Unpin for char

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### impl Unpin for f16

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### impl Unpin for f32

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### impl Unpin for f64

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### impl Unpin for f128

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### impl Unpin for i8

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### impl Unpin for i16

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### impl Unpin for i32

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### impl Unpin for i64

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### impl Unpin for i128

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### impl Unpin for isize

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### impl Unpin for !

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### impl Unpin for str

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### impl Unpin for u8

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### impl Unpin for u16

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### impl Unpin for u32

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### impl Unpin for u64

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### impl Unpin for u128

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### impl Unpin for ()

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### impl Unpin for usize

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### impl Unpin for AllocError

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### impl Unpin for Layout

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### impl Unpin for LayoutError

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### impl Unpin for TypeId

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### impl Unpin for float64x1_t

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### impl Unpin for float64x1x2_t

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### impl Unpin for float64x1x3_t

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### impl Unpin for float64x1x4_t

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### impl Unpin for float64x2_t

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### impl Unpin for float64x2x2_t

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### impl Unpin for float64x2x3_t

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### impl Unpin for float64x2x4_t

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### impl Unpin for SY

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### impl Unpin for float16x4_t

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### impl Unpin for float16x4x2_t

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### impl Unpin for float16x4x3_t

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### impl Unpin for float16x4x4_t

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### impl Unpin for float16x8_t

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### impl Unpin for float16x8x2_t

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### impl Unpin for float16x8x3_t

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### impl Unpin for float16x8x4_t

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### impl Unpin for float32x2_t

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### impl Unpin for float32x2x2_t

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### impl Unpin for float32x2x3_t

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### impl Unpin for float32x2x4_t

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### impl Unpin for float32x4_t

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### impl Unpin for float32x4x2_t

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### impl Unpin for float32x4x3_t

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### impl Unpin for float32x4x4_t

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### impl Unpin for int8x8_t

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### impl Unpin for int8x8x2_t

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### impl Unpin for int8x8x3_t

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### impl Unpin for int8x8x4_t

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### impl Unpin for int8x16_t

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### impl Unpin for int8x16x2_t

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### impl Unpin for int8x16x3_t

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### impl Unpin for int8x16x4_t

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### impl Unpin for int16x4_t

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### impl Unpin for int16x4x2_t

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### impl Unpin for int16x4x3_t

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### impl Unpin for int16x4x4_t

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### impl Unpin for int16x8_t

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### impl Unpin for int16x8x2_t

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### impl Unpin for int16x8x3_t

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### impl Unpin for int16x8x4_t

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### impl Unpin for int32x2_t

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### impl Unpin for int32x2x2_t

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### impl Unpin for int32x2x3_t

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### impl Unpin for int32x2x4_t

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### impl Unpin for int32x4_t

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### impl Unpin for int32x4x2_t

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### impl Unpin for int32x4x3_t

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### impl Unpin for int32x4x4_t

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### impl Unpin for int64x1_t

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### impl Unpin for int64x1x2_t

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### impl Unpin for int64x1x3_t

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### impl Unpin for int64x1x4_t

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### impl Unpin for int64x2_t

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### impl Unpin for int64x2x2_t

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### impl Unpin for int64x2x3_t

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### impl Unpin for int64x2x4_t

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### impl Unpin for poly8x8_t

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### impl Unpin for poly8x8x2_t

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### impl Unpin for poly8x8x3_t

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### impl Unpin for poly8x8x4_t

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### impl Unpin for poly8x16_t

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### impl Unpin for poly8x16x2_t

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### impl Unpin for poly8x16x3_t

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### impl Unpin for poly8x16x4_t

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### impl Unpin for poly16x4_t

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### impl Unpin for poly16x4x2_t

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### impl Unpin for poly16x4x3_t

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### impl Unpin for poly16x4x4_t

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### impl Unpin for poly16x8_t

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### impl Unpin for poly16x8x2_t

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### impl Unpin for poly16x8x3_t

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### impl Unpin for poly16x8x4_t

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### impl Unpin for poly64x1_t

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### impl Unpin for poly64x1x2_t

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### impl Unpin for poly64x1x3_t

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### impl Unpin for poly64x1x4_t

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### impl Unpin for poly64x2_t

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### impl Unpin for poly64x2x2_t

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### impl Unpin for poly64x2x3_t

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### impl Unpin for poly64x2x4_t

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### impl Unpin for uint8x8_t

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### impl Unpin for uint8x8x2_t

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### impl Unpin for uint8x8x3_t

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### impl Unpin for uint8x8x4_t

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### impl Unpin for uint8x16_t

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### impl Unpin for uint8x16x2_t

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### impl Unpin for uint8x16x3_t

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### impl Unpin for uint8x16x4_t

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### impl Unpin for uint16x4_t

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### impl Unpin for uint16x4x2_t

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### impl Unpin for uint16x4x3_t

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### impl Unpin for uint16x4x4_t

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### impl Unpin for uint16x8_t

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### impl Unpin for uint16x8x2_t

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### impl Unpin for uint16x8x3_t

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### impl Unpin for uint16x8x4_t

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### impl Unpin for uint32x2_t

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### impl Unpin for uint32x2x2_t

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### impl Unpin for uint32x2x3_t

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### impl Unpin for uint32x2x4_t

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### impl Unpin for uint32x4_t

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### impl Unpin for uint32x4x2_t

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### impl Unpin for uint32x4x3_t

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### impl Unpin for uint32x4x4_t

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### impl Unpin for uint64x1_t

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### impl Unpin for uint64x1x2_t

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### impl Unpin for uint64x1x3_t

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### impl Unpin for uint64x1x4_t

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### impl Unpin for uint64x2_t

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### impl Unpin for uint64x2x2_t

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### impl Unpin for uint64x2x3_t

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### impl Unpin for uint64x2x4_t

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### impl Unpin for m128

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### impl Unpin for m128d

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### impl Unpin for m128i

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### impl Unpin for m256

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### impl Unpin for m256d

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### impl Unpin for m256i

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### impl Unpin for f16x2

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### impl Unpin for core::arch::powerpc::vector_bool_char

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### impl Unpin for core::arch::powerpc::vector_bool_int

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### impl Unpin for vector_bool_long

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### impl Unpin for core::arch::powerpc::vector_bool_short

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### impl Unpin for core::arch::powerpc::vector_double

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### impl Unpin for core::arch::powerpc::vector_float

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### impl Unpin for core::arch::powerpc::vector_signed_char

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### impl Unpin for core::arch::powerpc::vector_signed_int

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### impl Unpin for vector_signed_long

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### impl Unpin for core::arch::powerpc::vector_signed_short

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### impl Unpin for core::arch::powerpc::vector_unsigned_char

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### impl Unpin for core::arch::powerpc::vector_unsigned_int

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### impl Unpin for vector_unsigned_long

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### impl Unpin for core::arch::powerpc::vector_unsigned_short

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### impl Unpin for core::arch::s390x::vector_bool_char

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### impl Unpin for core::arch::s390x::vector_bool_int

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### impl Unpin for vector_bool_long_long

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### impl Unpin for core::arch::s390x::vector_bool_short

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### impl Unpin for core::arch::s390x::vector_double

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### impl Unpin for core::arch::s390x::vector_float

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### impl Unpin for core::arch::s390x::vector_signed_char

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### impl Unpin for core::arch::s390x::vector_signed_int

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### impl Unpin for vector_signed_long_long

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### impl Unpin for core::arch::s390x::vector_signed_short

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### impl Unpin for core::arch::s390x::vector_unsigned_char

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### impl Unpin for core::arch::s390x::vector_unsigned_int

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### impl Unpin for vector_unsigned_long_long

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### impl Unpin for core::arch::s390x::vector_unsigned_short

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### impl Unpin for v128

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### impl Unpin for CpuidResult

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### impl Unpin for __m128

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### impl Unpin for __m128bh

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### impl Unpin for __m128d

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### impl Unpin for __m128h

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### impl Unpin for __m128i

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### impl Unpin for __m256

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### impl Unpin for __m256bh

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### impl Unpin for __m256d

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### impl Unpin for __m256h

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### impl Unpin for __m256i

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### impl Unpin for __m512

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### impl Unpin for __m512bh

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### impl Unpin for __m512d

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### impl Unpin for __m512h

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### impl Unpin for __m512i

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### impl Unpin for bf16

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### impl Unpin for TryFromSliceError

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### impl Unpin for core::ascii::EscapeDefault

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### impl Unpin for ByteStr

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### impl Unpin for BorrowError

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### impl Unpin for BorrowMutError

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### impl Unpin for CharTryFromError

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### impl Unpin for DecodeUtf16Error

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### impl Unpin for core::char::EscapeDebug

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### impl Unpin for core::char::EscapeDefault

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### impl Unpin for core::char::EscapeUnicode

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### impl Unpin for ParseCharError

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### impl Unpin for ToLowercase

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### impl Unpin for ToUppercase

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### impl Unpin for TryFromCharError

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### impl Unpin for CStr

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### impl Unpin for FromBytesUntilNulError

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### impl Unpin for Error

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### impl Unpin for FormattingOptions

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### impl Unpin for SipHasher

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### impl Unpin for Last

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### impl Unpin for ReturnToArg

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### impl Unpin for UnwindActionArg

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### impl Unpin for Assume

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### impl Unpin for Array

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### impl Unpin for Bool

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### impl Unpin for Char

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### impl Unpin for Field

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### impl Unpin for Float

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### impl Unpin for Int

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### impl Unpin for Reference

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### impl Unpin for Str

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### impl Unpin for Tuple

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### impl Unpin for Type

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### impl Unpin for AddrParseError

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### impl Unpin for Ipv4Addr

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### impl Unpin for Ipv6Addr

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### impl Unpin for SocketAddrV4

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### impl Unpin for SocketAddrV6

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### impl Unpin for ParseFloatError

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### impl Unpin for ParseIntError

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### impl Unpin for TryFromIntError

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### impl Unpin for RangeFull

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### impl Unpin for core::ptr::Alignment

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### impl Unpin for ParseBoolError

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### impl Unpin for Utf8Error

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### impl Unpin for AtomicBool

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### impl Unpin for AtomicI8

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### impl Unpin for AtomicI16

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### impl Unpin for AtomicI32

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### impl Unpin for AtomicI64

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### impl Unpin for AtomicIsize

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### impl Unpin for AtomicU8

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### impl Unpin for AtomicU16

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### impl Unpin for AtomicU32

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### impl Unpin for AtomicU64

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### impl Unpin for AtomicUsize

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### impl Unpin for RawWaker

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### impl Unpin for RawWakerVTable

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### impl Unpin for Duration

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### impl Unpin for TryFromFloatSecsError

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### impl<'a> Unpin for Utf8Pattern<'a>

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### impl<'a> Unpin for Source<'a>

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### impl<'a> Unpin for core::ffi::c_str::Bytes<'a>

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### impl<'a> Unpin for VaList<'a>

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### impl<'a> Unpin for Arguments<'a>

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### impl<'a> Unpin for Formatter<'a>

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### impl<'a> Unpin for BorrowedCursor<'a>

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### impl<'a> Unpin for Location<'a>

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### impl<'a> Unpin for PanicInfo<'a>

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### impl<'a> Unpin for PanicMessage<'a>

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### impl<'a> Unpin for EscapeAscii<'a>

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### impl<'a> Unpin for CharSearcher<'a>

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### impl<'a> Unpin for core::str::Bytes<'a>

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### impl<'a> Unpin for CharIndices<'a>

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### impl<'a> Unpin for Chars<'a>

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### impl<'a> Unpin for EncodeUtf16<'a>

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### impl<'a> Unpin for core::str::EscapeDebug<'a>

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### impl<'a> Unpin for core::str::EscapeDefault<'a>

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### impl<'a> Unpin for core::str::EscapeUnicode<'a>

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### impl<'a> Unpin for Lines<'a>

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### impl<'a> Unpin for LinesAny<'a>

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### impl<'a> Unpin for SplitAsciiWhitespace<'a>

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### impl<'a> Unpin for SplitWhitespace<'a>

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### impl<'a> Unpin for Utf8Chunk<'a>

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### impl<'a> Unpin for Utf8Chunks<'a>

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### impl<'a> Unpin for Context<'a>

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### impl<'a> Unpin for ContextBuilder<'a>

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### impl<'a> Unpin for PhantomContravariantLifetime<'a>

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### impl<'a> Unpin for PhantomCovariantLifetime<'a>

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### impl<'a> Unpin for PhantomInvariantLifetime<'a>

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### impl<'a, 'b> Unpin for DebugList<'a, 'b>

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### impl<'a, 'b> Unpin for DebugMap<'a, 'b>

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### impl<'a, 'b> Unpin for DebugSet<'a, 'b>

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### impl<'a, 'b> Unpin for DebugStruct<'a, 'b>

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### impl<'a, 'b> Unpin for DebugTuple<'a, 'b>

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### impl<'a, 'b> Unpin for CharSliceSearcher<'a, 'b>

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### impl<'a, 'b> Unpin for StrSearcher<'a, 'b>

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

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### impl<'a, A> Unpin for core::option::Iter<'a, A>

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### impl<'a, A> Unpin for core::option::IterMut<'a, A>

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### impl<'a, F> Unpin for CharPredicateSearcher<'a, F>
where F: Unpin,

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### impl<'a, I> Unpin for ByRefSized<'a, I>

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

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

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

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

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### impl<'a, P> Unpin for core::str::RSplit<'a, P>
where <P as Pattern>::Searcher<'a>: Unpin,

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### impl<'a, P> Unpin for core::str::RSplitN<'a, P>
where <P as Pattern>::Searcher<'a>: Unpin,

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

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### impl<'a, P> Unpin for core::str::Split<'a, P>
where <P as Pattern>::Searcher<'a>: Unpin,

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### impl<'a, P> Unpin for core::str::SplitInclusive<'a, P>
where <P as Pattern>::Searcher<'a>: Unpin,

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### impl<'a, P> Unpin for core::str::SplitN<'a, P>
where <P as Pattern>::Searcher<'a>: Unpin,

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

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### impl<'a, T> Unpin for core::result::Iter<'a, T>

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### impl<'a, T> Unpin for core::result::IterMut<'a, T>

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### impl<'a, T> Unpin for Chunks<'a, T>

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### impl<'a, T> Unpin for ChunksExact<'a, T>

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### impl<'a, T> Unpin for ChunksExactMut<'a, T>

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### impl<'a, T> Unpin for ChunksMut<'a, T>

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### impl<'a, T> Unpin for core::slice::Iter<'a, T>

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### impl<'a, T> Unpin for core::slice::IterMut<'a, T>

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### impl<'a, T> Unpin for RChunks<'a, T>

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### impl<'a, T> Unpin for RChunksExact<'a, T>

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### impl<'a, T> Unpin for RChunksExactMut<'a, T>

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### impl<'a, T> Unpin for RChunksMut<'a, T>

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### impl<'a, T> Unpin for Windows<'a, T>

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### impl<'a, T, P> Unpin for ChunkBy<'a, T, P>
where P: Unpin,

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### impl<'a, T, P> Unpin for ChunkByMut<'a, T, P>
where P: Unpin,

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### impl<'a, T, P> Unpin for core::slice::RSplit<'a, T, P>
where P: Unpin,

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

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### impl<'a, T, P> Unpin for core::slice::RSplitN<'a, T, P>
where P: Unpin,

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

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### impl<'a, T, P> Unpin for core::slice::Split<'a, T, P>
where P: Unpin,

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### impl<'a, T, P> Unpin for core::slice::SplitInclusive<'a, T, P>
where P: Unpin,

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### impl<'a, T, P> Unpin for SplitInclusiveMut<'a, T, P>
where P: Unpin,

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

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### impl<'a, T, P> Unpin for core::slice::SplitN<'a, T, P>
where P: Unpin,

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

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### impl<'a, T, const N: usize> Unpin for ArrayWindows<'a, T, N>

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

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### impl<'b, T> Unpin for Ref<'b, T>
where T: ?Sized,

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### impl<'b, T> Unpin for RefMut<'b, T>
where T: ?Sized,

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

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### impl<A> Unpin for Repeat<A>
where A: Unpin,

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### impl<A> Unpin for RepeatN<A>
where A: Unpin,

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### impl<A> Unpin for core::option::IntoIter<A>
where A: Unpin,

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### impl<A> Unpin for OptionFlatten<A>
where A: Unpin,

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### impl<A> Unpin for RangeFromIter<A>
where A: Unpin,

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### impl<A> Unpin for RangeInclusiveIter<A>
where A: Unpin,

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### impl<A> Unpin for RangeIter<A>
where A: Unpin,

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### impl<A, B> Unpin for Chain<A, B>
where A: Unpin, B: Unpin,

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### impl<A, B> Unpin for Zip<A, B>
where A: Unpin, B: Unpin,

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### impl<B, C> Unpin for ControlFlow<B, C>
where C: Unpin, B: Unpin,

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### impl<F> Unpin for core::fmt::FromFn<F>
where F: Unpin,

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### impl<F> Unpin for core::iter::FromFn<F>
where F: Unpin,

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### impl<F> Unpin for OnceWith<F>
where F: Unpin,

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### impl<F> Unpin for RepeatWith<F>
where F: Unpin,

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### impl<G> Unpin for FromCoroutine<G>
where G: Unpin,

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### impl<H> Unpin for BuildHasherDefault<H>

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### impl<I> Unpin for DecodeUtf16<I>
where I: Unpin,

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### impl<I> Unpin for Cloned<I>
where I: Unpin,

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### impl<I> Unpin for Copied<I>
where I: Unpin,

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### impl<I> Unpin for Cycle<I>
where I: Unpin,

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### impl<I> Unpin for Enumerate<I>
where I: Unpin,

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

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### impl<I> Unpin for Fuse<I>
where I: Unpin,

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### impl<I> Unpin for Intersperse<I>
where <I as Iterator>::Item: Sized + Unpin, I: Unpin,

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

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### impl<I> Unpin for Skip<I>
where I: Unpin,

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### impl<I> Unpin for StepBy<I>
where I: Unpin,

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### impl<I> Unpin for Take<I>
where I: Unpin,

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### impl<I, F> Unpin for FilterMap<I, F>
where I: Unpin, F: Unpin,

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### impl<I, F> Unpin for Inspect<I, F>
where I: Unpin, F: Unpin,

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### impl<I, F> Unpin for Map<I, F>
where I: Unpin, F: Unpin,

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### impl<I, F, const N: usize> Unpin for MapWindows<I, F, N>
where F: Unpin, I: Unpin, <I as Iterator>::Item: Unpin,

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### impl<I, G> Unpin for IntersperseWith<I, G>
where G: Unpin, <I as Iterator>::Item: Unpin, I: Unpin,

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### impl<I, P> Unpin for Filter<I, P>
where I: Unpin, P: Unpin,

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### impl<I, P> Unpin for MapWhile<I, P>
where I: Unpin, P: Unpin,

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### impl<I, P> Unpin for SkipWhile<I, P>
where I: Unpin, P: Unpin,

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### impl<I, P> Unpin for TakeWhile<I, P>
where I: Unpin, P: Unpin,

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

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

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### impl<I, const N: usize> Unpin for ArrayChunks<I, N>
where I: Unpin, <I as Iterator>::Item: Unpin,

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### impl<Idx> Unpin for Clamp<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for core::ops::Range<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for core::ops::RangeFrom<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for core::ops::RangeInclusive<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for RangeTo<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for core::ops::RangeToInclusive<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for core::range::Range<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for core::range::RangeFrom<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for core::range::RangeInclusive<Idx>
where Idx: Unpin,

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### impl<Idx> Unpin for core::range::RangeToInclusive<Idx>
where Idx: Unpin,

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### impl<P> Unpin for MaybeDangling<P>
where P: Unpin + ?Sized,

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### impl<Ptr> Unpin for Pin<Ptr>
where Ptr: Unpin,

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

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### impl<T> Unpin for Bound<T>
where T: Unpin,

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### impl<T> Unpin for Option<T>
where T: Unpin,

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### impl<T> Unpin for Poll<T>
where T: Unpin,

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### impl<T> Unpin for [T]
where T: Unpin,

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### impl<T> Unpin for (T₁, T₂, …, Tₙ)
where T: Unpin,

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### impl<T> Unpin for Cell<T>
where T: Unpin + ?Sized,

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### impl<T> Unpin for OnceCell<T>
where T: Unpin,

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### impl<T> Unpin for RefCell<T>
where T: Unpin + ?Sized,

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

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### impl<T> Unpin for UnsafeCell<T>
where T: Unpin + ?Sized,

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

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### impl<T> Unpin for NumBuffer<T>
where T: Unpin,

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### impl<T> Unpin for Pending<T>

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### impl<T> Unpin for Empty<T>

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### impl<T> Unpin for Once<T>
where T: Unpin,

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### impl<T> Unpin for Rev<T>
where T: Unpin,

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### impl<T> Unpin for Discriminant<T>

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

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### impl<T> Unpin for Saturating<T>
where T: Unpin,

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### impl<T> Unpin for Wrapping<T>
where T: Unpin,

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### impl<T> Unpin for Yeet<T>
where T: Unpin,

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### impl<T> Unpin for AssertUnwindSafe<T>
where T: Unpin,

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

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### impl<T> Unpin for core::result::IntoIter<T>
where T: Unpin,

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### impl<T> Unpin for AtomicPtr<T>

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

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### impl<T> Unpin for PhantomContravariant<T>
where T: ?Sized,

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### impl<T> Unpin for PhantomCovariant<T>
where T: ?Sized,

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

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### impl<T> Unpin for PhantomInvariant<T>
where T: ?Sized,

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### impl<T> Unpin for MaybeUninit<T>
where T: Unpin,

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### impl<T, E> Unpin for Result<T, E>
where T: Unpin, E: Unpin,

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### impl<T, F> Unpin for LazyCell<T, F>
where F: Unpin, T: Unpin,

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### impl<T, F> Unpin for Successors<T, F>
where F: Unpin, T: Unpin,

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### impl<T, F> Unpin for DropGuard<T, F>
where T: Unpin, F: Unpin,

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### impl<T, const N: usize> Unpin for [T; N]
where T: Unpin,

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### impl<T, const N: usize> Unpin for core::array::IntoIter<T, N>
where T: Unpin,

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### impl<T, const N: usize> Unpin for Mask<T, N>
where T: Unpin,

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### impl<T, const N: usize> Unpin for Simd<T, N>
where T: Unpin,

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### impl<T, const N: usize> Unpin for [Option<T>; N]
where T: Unpin,

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### impl<T, const N: usize> Unpin for [MaybeUninit<T>; N]
where T: Unpin,

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

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### impl<const N: usize> Unpin for LaneCount<N>

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