UnwindSafe in core::panic - Rust
Description: A marker trait which represents “panic safe” types in Rust.

# Trait UnwindSafe

1.41.0 · Source

    pub auto trait UnwindSafe { }

Expand description

A marker trait which represents “panic safe” types in Rust.

This trait is implemented by default for many types and behaves similarly in terms of inference of implementation to the `Send` and `Sync` traits. The purpose of this trait is to encode what types are safe to cross a `catch_unwind` boundary with no fear of unwind safety.

### §What is unwind safety?

In Rust a function can “return” early if it either panics or calls a function which transitively panics. This sort of control flow is not always anticipated, and has the possibility of causing subtle bugs through a combination of two critical components:

1. A data structure is in a temporarily invalid state when the thread panics.
2. This broken invariant is then later observed.

Typically in Rust, it is difficult to perform step (2) because catching a panic involves either spawning a thread (which in turn makes it difficult to later witness broken invariants) or using the `catch_unwind` function in this module. Additionally, even if an invariant is witnessed, it typically isn’t a problem in Rust because there are no uninitialized values (like in C or C++).

It is possible, however, for logical invariants to be broken in Rust, which can end up causing behavioral bugs. Another key aspect of unwind safety in Rust is that, in the absence of `unsafe` code, a panic cannot lead to memory unsafety.

That was a bit of a whirlwind tour of unwind safety, but for more information about unwind safety and how it applies to Rust, see an associated RFC.

### §What is `UnwindSafe`?

Now that we’ve got an idea of what unwind safety is in Rust, it’s also important to understand what this trait represents. As mentioned above, one way to witness broken invariants is through the `catch_unwind` function in this module as it allows catching a panic and then re-using the environment of the closure.

Simply put, a type `T` implements `UnwindSafe` if it cannot easily allow witnessing a broken invariant through the use of `catch_unwind` (catching a panic). This trait is an auto trait, so it is automatically implemented for many types, and it is also structurally composed (e.g., a struct is unwind safe if all of its components are unwind safe).

Note, however, that this is not an unsafe trait, so there is not a succinct contract that this trait is providing. Instead it is intended as more of a “speed bump” to alert users of `catch_unwind` that broken invariants may be witnessed and may need to be accounted for.

### §Who implements `UnwindSafe`?

Types such as `&mut T` and `&RefCell<T>` are examples which are not unwind safe. The general idea is that any mutable state which can be shared across `catch_unwind` is not unwind safe by default. This is because it is very easy to witness a broken invariant outside of `catch_unwind` as the data is simply accessed as usual.

Types like `&Mutex<T>`, however, are unwind safe because they implement poisoning by default. They still allow witnessing a broken invariant, but they already provide their own “speed bumps” to do so.

### §When should `UnwindSafe` be used?

It is not intended that most types or functions need to worry about this trait. It is only used as a bound on the `catch_unwind` function and as mentioned above, the lack of `unsafe` means it is mostly an advisory. The `AssertUnwindSafe` wrapper struct can be used to force this trait to be implemented for any closed over variables passed to `catch_unwind`.

## Implementors§

1.28.0 · Source§

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

1.9.0 · Source§

### impl<T> UnwindSafe for AssertUnwindSafe<T>

1.9.0 · Source§

### impl<T: RefUnwindSafe + ?Sized> UnwindSafe for *const T

1.9.0 · Source§

### impl<T: RefUnwindSafe + ?Sized> UnwindSafe for *mut T

1.9.0 · Source§

### impl<T: RefUnwindSafe + ?Sized> UnwindSafe for &T

1.25.0 · Source§

### impl<T: RefUnwindSafe + ?Sized> UnwindSafe for NonNull<T>

1.9.0 · Source§

### impl<T: ?Sized> !UnwindSafe for &mut T

## Auto implementors§

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### impl UnwindSafe for AsciiChar

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### impl UnwindSafe for core::cmp::Ordering

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### impl UnwindSafe for Infallible

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### impl UnwindSafe for FromBytesWithNulError

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### impl UnwindSafe for c_void

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### impl UnwindSafe for core::fmt::Alignment

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### impl UnwindSafe for DebugAsHex

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### impl UnwindSafe for Sign

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### impl UnwindSafe for BasicBlock

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### impl UnwindSafe for UnwindTerminateReason

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### impl UnwindSafe for IpAddr

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### impl UnwindSafe for Ipv6MulticastScope

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### impl UnwindSafe for SocketAddr

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### impl UnwindSafe for FpCategory

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### impl UnwindSafe for IntErrorKind

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### impl UnwindSafe for OneSidedRangeBound

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### impl UnwindSafe for GetDisjointMutError

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### impl UnwindSafe for SearchStep

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

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### impl UnwindSafe for bool

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### impl UnwindSafe for char

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### impl UnwindSafe for f16

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### impl UnwindSafe for f32

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### impl UnwindSafe for f64

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### impl UnwindSafe for f128

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### impl UnwindSafe for i8

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### impl UnwindSafe for i16

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### impl UnwindSafe for i32

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### impl UnwindSafe for i64

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### impl UnwindSafe for i128

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### impl UnwindSafe for isize

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### impl UnwindSafe for str

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### impl UnwindSafe for u8

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### impl UnwindSafe for u16

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### impl UnwindSafe for u32

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### impl UnwindSafe for u64

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### impl UnwindSafe for u128

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### impl UnwindSafe for ()

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### impl UnwindSafe for usize

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### impl UnwindSafe for AllocError

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### impl UnwindSafe for Layout

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### impl UnwindSafe for LayoutError

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### impl UnwindSafe for TypeId

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### impl UnwindSafe for float64x1_t

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### impl UnwindSafe for float64x1x2_t

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### impl UnwindSafe for float64x1x3_t

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### impl UnwindSafe for float64x1x4_t

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### impl UnwindSafe for float64x2_t

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### impl UnwindSafe for float64x2x2_t

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### impl UnwindSafe for float64x2x3_t

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### impl UnwindSafe for float64x2x4_t

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### impl UnwindSafe for SY

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### impl UnwindSafe for float16x4_t

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### impl UnwindSafe for float16x4x2_t

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### impl UnwindSafe for float16x4x3_t

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### impl UnwindSafe for float16x4x4_t

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### impl UnwindSafe for float16x8_t

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### impl UnwindSafe for float16x8x2_t

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### impl UnwindSafe for float16x8x3_t

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### impl UnwindSafe for float16x8x4_t

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### impl UnwindSafe for float32x2_t

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### impl UnwindSafe for float32x2x2_t

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### impl UnwindSafe for float32x2x3_t

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### impl UnwindSafe for float32x2x4_t

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### impl UnwindSafe for float32x4_t

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### impl UnwindSafe for float32x4x2_t

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### impl UnwindSafe for float32x4x3_t

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### impl UnwindSafe for float32x4x4_t

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### impl UnwindSafe for int8x8_t

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### impl UnwindSafe for int8x8x2_t

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### impl UnwindSafe for int8x8x3_t

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### impl UnwindSafe for int8x8x4_t

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### impl UnwindSafe for int8x16_t

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### impl UnwindSafe for int8x16x2_t

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### impl UnwindSafe for int8x16x3_t

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### impl UnwindSafe for int8x16x4_t

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### impl UnwindSafe for int16x4_t

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### impl UnwindSafe for int16x4x2_t

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### impl UnwindSafe for int16x4x3_t

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### impl UnwindSafe for int16x4x4_t

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### impl UnwindSafe for int16x8_t

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### impl UnwindSafe for int16x8x2_t

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### impl UnwindSafe for int16x8x3_t

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### impl UnwindSafe for int16x8x4_t

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### impl UnwindSafe for int32x2_t

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### impl UnwindSafe for int32x2x2_t

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### impl UnwindSafe for int32x2x3_t

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### impl UnwindSafe for int32x2x4_t

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### impl UnwindSafe for int32x4_t

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### impl UnwindSafe for int32x4x2_t

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### impl UnwindSafe for int32x4x3_t

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### impl UnwindSafe for int32x4x4_t

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### impl UnwindSafe for int64x1_t

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### impl UnwindSafe for int64x1x2_t

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### impl UnwindSafe for int64x1x3_t

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### impl UnwindSafe for int64x1x4_t

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### impl UnwindSafe for int64x2_t

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### impl UnwindSafe for int64x2x2_t

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### impl UnwindSafe for int64x2x3_t

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### impl UnwindSafe for int64x2x4_t

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### impl UnwindSafe for poly8x8_t

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### impl UnwindSafe for poly8x8x2_t

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### impl UnwindSafe for poly8x8x3_t

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### impl UnwindSafe for poly8x8x4_t

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### impl UnwindSafe for poly8x16_t

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### impl UnwindSafe for poly8x16x2_t

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### impl UnwindSafe for poly8x16x3_t

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### impl UnwindSafe for poly8x16x4_t

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### impl UnwindSafe for poly16x4_t

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### impl UnwindSafe for poly16x4x2_t

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### impl UnwindSafe for poly16x4x3_t

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### impl UnwindSafe for poly16x4x4_t

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### impl UnwindSafe for poly16x8_t

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### impl UnwindSafe for poly16x8x2_t

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### impl UnwindSafe for poly16x8x3_t

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### impl UnwindSafe for poly16x8x4_t

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### impl UnwindSafe for poly64x1_t

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### impl UnwindSafe for poly64x1x2_t

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### impl UnwindSafe for poly64x1x3_t

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### impl UnwindSafe for poly64x1x4_t

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### impl UnwindSafe for poly64x2_t

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### impl UnwindSafe for poly64x2x2_t

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### impl UnwindSafe for poly64x2x3_t

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### impl UnwindSafe for poly64x2x4_t

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### impl UnwindSafe for uint8x8_t

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### impl UnwindSafe for uint8x8x2_t

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### impl UnwindSafe for uint8x8x3_t

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### impl UnwindSafe for uint8x8x4_t

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### impl UnwindSafe for uint8x16_t

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### impl UnwindSafe for uint8x16x2_t

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### impl UnwindSafe for uint8x16x3_t

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### impl UnwindSafe for uint8x16x4_t

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### impl UnwindSafe for uint16x4_t

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### impl UnwindSafe for uint16x4x2_t

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### impl UnwindSafe for uint16x4x3_t

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### impl UnwindSafe for uint16x4x4_t

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### impl UnwindSafe for uint16x8_t

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### impl UnwindSafe for uint16x8x2_t

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### impl UnwindSafe for uint16x8x3_t

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### impl UnwindSafe for uint16x8x4_t

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### impl UnwindSafe for uint32x2_t

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### impl UnwindSafe for uint32x2x2_t

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### impl UnwindSafe for uint32x2x3_t

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### impl UnwindSafe for uint32x2x4_t

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### impl UnwindSafe for uint32x4_t

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### impl UnwindSafe for uint32x4x2_t

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### impl UnwindSafe for uint32x4x3_t

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### impl UnwindSafe for uint32x4x4_t

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### impl UnwindSafe for uint64x1_t

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### impl UnwindSafe for uint64x1x2_t

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### impl UnwindSafe for uint64x1x3_t

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### impl UnwindSafe for uint64x1x4_t

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### impl UnwindSafe for uint64x2_t

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### impl UnwindSafe for uint64x2x2_t

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### impl UnwindSafe for uint64x2x3_t

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### impl UnwindSafe for uint64x2x4_t

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### impl UnwindSafe for v2f64

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### impl UnwindSafe for v2i64

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### impl UnwindSafe for v2u64

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### impl UnwindSafe for v4f32

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### impl UnwindSafe for v4f64

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### impl UnwindSafe for v4i32

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### impl UnwindSafe for v4i64

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### impl UnwindSafe for v4u32

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### impl UnwindSafe for v4u64

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### impl UnwindSafe for v8f32

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### impl UnwindSafe for v8i16

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### impl UnwindSafe for v8i32

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### impl UnwindSafe for v8u16

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### impl UnwindSafe for v8u32

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### impl UnwindSafe for v16i8

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### impl UnwindSafe for v16i16

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### impl UnwindSafe for v16u8

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### impl UnwindSafe for v16u16

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### impl UnwindSafe for v32i8

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### impl UnwindSafe for v32u8

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### impl UnwindSafe for f16x2

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

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

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### impl UnwindSafe for vector_bool_long

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

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

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

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

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

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### impl UnwindSafe for vector_signed_long

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

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

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

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### impl UnwindSafe for vector_unsigned_long

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

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

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

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### impl UnwindSafe for vector_bool_long_long

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

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

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

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

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

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### impl UnwindSafe for vector_signed_long_long

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

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

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

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### impl UnwindSafe for vector_unsigned_long_long

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

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### impl UnwindSafe for v128

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### impl UnwindSafe for CpuidResult

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### impl UnwindSafe for __m128

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### impl UnwindSafe for __m128bh

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### impl UnwindSafe for __m128d

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### impl UnwindSafe for __m128h

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### impl UnwindSafe for __m128i

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### impl UnwindSafe for __m256

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### impl UnwindSafe for __m256bh

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### impl UnwindSafe for __m256d

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### impl UnwindSafe for __m256h

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### impl UnwindSafe for __m256i

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### impl UnwindSafe for __m512

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### impl UnwindSafe for __m512bh

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### impl UnwindSafe for __m512d

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### impl UnwindSafe for __m512h

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### impl UnwindSafe for __m512i

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### impl UnwindSafe for bf16

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### impl UnwindSafe for TryFromSliceError

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### impl UnwindSafe for core::ascii::EscapeDefault

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### impl UnwindSafe for ByteStr

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### impl UnwindSafe for BorrowError

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### impl UnwindSafe for BorrowMutError

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### impl UnwindSafe for CharTryFromError

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### impl UnwindSafe for DecodeUtf16Error

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### impl UnwindSafe for core::char::EscapeDebug

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### impl UnwindSafe for core::char::EscapeDefault

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### impl UnwindSafe for core::char::EscapeUnicode

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### impl UnwindSafe for ParseCharError

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### impl UnwindSafe for ToLowercase

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### impl UnwindSafe for ToUppercase

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### impl UnwindSafe for TryFromCharError

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### impl UnwindSafe for CStr

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### impl UnwindSafe for FromBytesUntilNulError

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### impl UnwindSafe for Error

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### impl UnwindSafe for FormattingOptions

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### impl UnwindSafe for SipHasher

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### impl UnwindSafe for ReturnToArg

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### impl UnwindSafe for UnwindActionArg

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### impl UnwindSafe for PhantomPinned

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### impl UnwindSafe for Assume

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### impl UnwindSafe for AddrParseError

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### impl UnwindSafe for Ipv4Addr

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### impl UnwindSafe for Ipv6Addr

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### impl UnwindSafe for SocketAddrV4

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### impl UnwindSafe for SocketAddrV6

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### impl UnwindSafe for ParseFloatError

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### impl UnwindSafe for ParseIntError

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### impl UnwindSafe for TryFromIntError

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### impl UnwindSafe for RangeFull

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### impl UnwindSafe for core::ptr::Alignment

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### impl UnwindSafe for ParseBoolError

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### impl UnwindSafe for Utf8Error

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### impl UnwindSafe for AtomicBool

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### impl UnwindSafe for AtomicI8

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### impl UnwindSafe for AtomicI16

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### impl UnwindSafe for AtomicI32

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### impl UnwindSafe for AtomicI64

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### impl UnwindSafe for AtomicIsize

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### impl UnwindSafe for AtomicU8

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### impl UnwindSafe for AtomicU16

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### impl UnwindSafe for AtomicU32

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### impl UnwindSafe for AtomicU64

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### impl UnwindSafe for AtomicUsize

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### impl UnwindSafe for LocalWaker

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### impl UnwindSafe for RawWaker

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### impl UnwindSafe for RawWakerVTable

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### impl UnwindSafe for Waker

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### impl UnwindSafe for Duration

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### impl UnwindSafe for TryFromFloatSecsError

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

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### impl<'a> !UnwindSafe for Source<'a>

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

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### impl<'a> !UnwindSafe for BorrowedCursor<'a>

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### impl<'a> !UnwindSafe for ContextBuilder<'a>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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### impl<'a, 'b> !UnwindSafe for DebugList<'a, 'b>

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### impl<'a, 'b> !UnwindSafe for DebugMap<'a, 'b>

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### impl<'a, 'b> !UnwindSafe for DebugSet<'a, 'b>

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### impl<'a, 'b> !UnwindSafe for DebugStruct<'a, 'b>

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### impl<'a, 'b> !UnwindSafe for DebugTuple<'a, 'b>

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

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

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

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### impl<'a, 'f> !UnwindSafe for VaList<'a, 'f>

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

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### impl<'a, A> UnwindSafe for core::option::Iter<'a, A>
where A: RefUnwindSafe,

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

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### impl<'a, I> !UnwindSafe for ByRefSized<'a, I>

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

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

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

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

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

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

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

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

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

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

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

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

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### impl<'a, T> !UnwindSafe for ChunksExactMut<'a, T>

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### impl<'a, T> !UnwindSafe for ChunksMut<'a, T>

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

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### impl<'a, T> !UnwindSafe for RChunksExactMut<'a, T>

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### impl<'a, T> !UnwindSafe for RChunksMut<'a, T>

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### impl<'a, T> UnwindSafe for core::result::Iter<'a, T>
where T: RefUnwindSafe,

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### impl<'a, T> UnwindSafe for Chunks<'a, T>
where T: RefUnwindSafe,

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### impl<'a, T> UnwindSafe for ChunksExact<'a, T>
where T: RefUnwindSafe,

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### impl<'a, T> UnwindSafe for core::slice::Iter<'a, T>
where T: RefUnwindSafe,

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### impl<'a, T> UnwindSafe for RChunks<'a, T>
where T: RefUnwindSafe,

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

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

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### impl<'a, T, P> !UnwindSafe for ChunkByMut<'a, T, P>

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### impl<'a, T, P> !UnwindSafe for RSplitMut<'a, T, P>

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### impl<'a, T, P> !UnwindSafe for RSplitNMut<'a, T, P>

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### impl<'a, T, P> !UnwindSafe for SplitInclusiveMut<'a, T, P>

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### impl<'a, T, P> !UnwindSafe for SplitMut<'a, T, P>

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### impl<'a, T, P> !UnwindSafe for SplitNMut<'a, T, P>

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

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

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

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

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

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

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### impl<'a, T, const N: usize> !UnwindSafe for ArrayChunksMut<'a, T, N>

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### impl<'a, T, const N: usize> UnwindSafe for core::slice::ArrayChunks<'a, T, N>
where T: RefUnwindSafe,

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### impl<'a, T, const N: usize> UnwindSafe for ArrayWindows<'a, T, N>
where T: RefUnwindSafe,

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

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

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

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### impl<'data> !UnwindSafe for BorrowedBuf<'data>

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

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

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

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

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### impl<A> UnwindSafe for IterRange<A>
where A: UnwindSafe,

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### impl<A> UnwindSafe for IterRangeFrom<A>
where A: UnwindSafe,

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### impl<A> UnwindSafe for IterRangeInclusive<A>
where A: UnwindSafe,

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

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

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

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### impl<Dyn> !UnwindSafe for DynMetadata<Dyn>

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

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### impl<F> UnwindSafe for PollFn<F>
where F: UnwindSafe,

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

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

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

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

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### impl<H> UnwindSafe for BuildHasherDefault<H>

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### impl<I> UnwindSafe for FromIter<I>
where I: UnwindSafe,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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### impl<Idx> UnwindSafe for RangeToInclusive<Idx>
where Idx: UnwindSafe,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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### impl<T> UnwindSafe for Pending<T>

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### impl<T> UnwindSafe for Ready<T>
where T: UnwindSafe,

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### impl<T> UnwindSafe for Empty<T>

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

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

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

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

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

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

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### impl<T> UnwindSafe for Discriminant<T>
where <T as DiscriminantKind>::Discriminant: UnwindSafe,

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

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

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

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

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### impl<T> UnwindSafe for UnsafePinned<T>
where T: UnwindSafe + ?Sized,

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

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### impl<T> UnwindSafe for AtomicPtr<T>
where T: RefUnwindSafe,

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

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

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

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

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

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

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

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

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

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

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

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

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

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