Trait std::marker::StructuralPartialEq

pub trait StructuralPartialEq { }

🔬This is a nightly-only experimental API. (structural_match #31434)

Required trait for constants used in pattern matches.

Any type that derives PartialEq automatically implements this trait, regardless of whether its type-parameters implement Eq.

If a const item contains some type that does not implement this trait, then that type either (1.) does not implement PartialEq (which means the constant will not provide that comparison method, which code generation assumes is available), or (2.) it implements its own version of PartialEq (which we assume does not conform to a structural-equality comparison).

In either of the two scenarios above, we reject usage of such a constant in a pattern match.

See also the structural match RFC, and issue 63438 which motivated migrating from attribute-based design to this trait.

Implementors

impl StructuralPartialEq for hashbrown::TryReserveError

impl StructuralPartialEq for AsciiChar

impl StructuralPartialEq for BacktraceStatus

impl StructuralPartialEq for PrintFmt

impl StructuralPartialEq for std::cmp::Ordering

impl StructuralPartialEq for TryReserveErrorKind

impl StructuralPartialEq for VarError

impl StructuralPartialEq for std::fmt::Alignment

impl StructuralPartialEq for SeekFrom

impl StructuralPartialEq for ErrorKind

impl StructuralPartialEq for IpAddr

impl StructuralPartialEq for Ipv6MulticastScope

impl StructuralPartialEq for Shutdown

impl StructuralPartialEq for SocketAddr

impl StructuralPartialEq for FpCategory

impl StructuralPartialEq for IntErrorKind

impl StructuralPartialEq for BacktraceStyle

impl StructuralPartialEq for std::path::State

impl StructuralPartialEq for Which

impl StructuralPartialEq for SearchStep

impl StructuralPartialEq for std::sync::atomic::Ordering

impl StructuralPartialEq for Selected

impl StructuralPartialEq for RecvTimeoutError

impl StructuralPartialEq for TryRecvError

impl StructuralPartialEq for ReparsePoint

impl StructuralPartialEq for std::sys::windows::pipe::State

impl StructuralPartialEq for bool

impl StructuralPartialEq for char

impl StructuralPartialEq for i8

impl StructuralPartialEq for i16

impl StructuralPartialEq for i32

impl StructuralPartialEq for i64

impl StructuralPartialEq for i128

impl StructuralPartialEq for isize

impl StructuralPartialEq for str

impl StructuralPartialEq for u8

impl StructuralPartialEq for u16

impl StructuralPartialEq for u32

impl StructuralPartialEq for u64

impl StructuralPartialEq for u128

impl StructuralPartialEq for ()

impl StructuralPartialEq for usize

impl StructuralPartialEq for CpuidResult

impl StructuralPartialEq for FromBytesUntilNulError

impl StructuralPartialEq for AllocError

impl StructuralPartialEq for Layout

impl StructuralPartialEq for LayoutError

impl StructuralPartialEq for CharTryFromError

impl StructuralPartialEq for DecodeUtf16Error

impl StructuralPartialEq for ParseCharError

impl StructuralPartialEq for TryFromCharError

impl StructuralPartialEq for std::collections::TryReserveError

impl StructuralPartialEq for CString

impl StructuralPartialEq for FromBytesWithNulError

impl StructuralPartialEq for FromVecWithNulError

impl StructuralPartialEq for IntoStringError

impl StructuralPartialEq for NulError

impl StructuralPartialEq for Error

impl StructuralPartialEq for std::fs::FileType

impl StructuralPartialEq for Permissions

impl StructuralPartialEq for Assume

impl StructuralPartialEq for AddrParseError

impl StructuralPartialEq for Ipv4Addr

impl StructuralPartialEq for Ipv6Addr

impl StructuralPartialEq for SocketAddrV4

impl StructuralPartialEq for SocketAddrV6

impl StructuralPartialEq for NonZeroI8

impl StructuralPartialEq for NonZeroI16

impl StructuralPartialEq for NonZeroI32

impl StructuralPartialEq for NonZeroI64

impl StructuralPartialEq for NonZeroI128

impl StructuralPartialEq for NonZeroIsize

impl StructuralPartialEq for NonZeroU8

impl StructuralPartialEq for NonZeroU16

impl StructuralPartialEq for NonZeroU32

impl StructuralPartialEq for NonZeroU64

impl StructuralPartialEq for NonZeroU128

impl StructuralPartialEq for NonZeroUsize

impl StructuralPartialEq for ParseFloatError

impl StructuralPartialEq for ParseIntError

impl StructuralPartialEq for TryFromIntError

impl StructuralPartialEq for RangeFull

impl StructuralPartialEq for InvalidHandleError

Available on Windows only.

impl StructuralPartialEq for NullHandleError

Available on Windows only.

impl StructuralPartialEq for StripPrefixError

impl StructuralPartialEq for std::process::ExitStatus

impl StructuralPartialEq for std::process::ExitStatusError

impl StructuralPartialEq for Output

impl StructuralPartialEq for std::ptr::Alignment

impl StructuralPartialEq for ParseBoolError

impl StructuralPartialEq for Utf8Error

impl StructuralPartialEq for FromUtf8Error

impl StructuralPartialEq for String

impl StructuralPartialEq for WaitTimeoutResult

impl StructuralPartialEq for Operation

impl StructuralPartialEq for RecvError

impl StructuralPartialEq for FilePermissions

impl StructuralPartialEq for std::sys::windows::fs::FileType

impl StructuralPartialEq for ExitCode

impl StructuralPartialEq for std::sys::windows::process::ExitStatus

impl StructuralPartialEq for std::sys::windows::process::ExitStatusError

impl StructuralPartialEq for std::sys::windows::time::Instant

impl StructuralPartialEq for CodePoint

impl StructuralPartialEq for Wtf8

impl StructuralPartialEq for Wtf8Buf

impl StructuralPartialEq for RawWaker

impl StructuralPartialEq for RawWakerVTable

impl StructuralPartialEq for AccessError

impl StructuralPartialEq for ThreadId

impl StructuralPartialEq for Duration

impl StructuralPartialEq for std::time::Instant

impl StructuralPartialEq for SystemTime

impl StructuralPartialEq for TryFromFloatSecsError

impl StructuralPartialEq for PhantomPinned

impl<'a> StructuralPartialEq for Component<'a>

impl<'a> StructuralPartialEq for Prefix<'a>

impl<'a> StructuralPartialEq for Location<'a>

impl<'a> StructuralPartialEq for Utf8Chunk<'a>

impl<A, Z, Y, X, W, V, U, T> StructuralPartialEq for (A, Z, Y, X, W, V, U, T)

impl<B, A, Z, Y, X, W, V, U, T> StructuralPartialEq for (B, A, Z, Y, X, W, V, U, T)

impl<B, C> StructuralPartialEq for ControlFlow<B, C>

impl<C, B, A, Z, Y, X, W, V, U, T> StructuralPartialEq for (C, B, A, Z, Y, X, W, V, U, T)

impl<D, C, B, A, Z, Y, X, W, V, U, T> StructuralPartialEq for (D, C, B, A, Z, Y, X, W, V, U, T)

impl<E, D, C, B, A, Z, Y, X, W, V, U, T> StructuralPartialEq for (E, D, C, B, A, Z, Y, X, W, V, U, T)

impl<Idx> StructuralPartialEq for Range<Idx>

impl<Idx> StructuralPartialEq for RangeFrom<Idx>

impl<Idx> StructuralPartialEq for RangeInclusive<Idx>

impl<Idx> StructuralPartialEq for RangeTo<Idx>

impl<Idx> StructuralPartialEq for RangeToInclusive<Idx>

impl<T> StructuralPartialEq for Bound<T>

impl<T> StructuralPartialEq for Option<T>

impl<T> StructuralPartialEq for SendTimeoutError<T>

impl<T> StructuralPartialEq for TrySendError<T>

impl<T> StructuralPartialEq for Poll<T>

impl<T> StructuralPartialEq for &Twhere T: ?Sized,

impl<T> StructuralPartialEq for [T]

impl<T> StructuralPartialEq for (T₁, T₂, …, Tₙ)

This trait is implemented for tuples up to twelve items long.

impl<T> StructuralPartialEq for Reverse<T>

impl<T> StructuralPartialEq for Cursor<T>

impl<T> StructuralPartialEq for ManuallyDrop<T>where T: ?Sized,

impl<T> StructuralPartialEq for Saturating<T>

impl<T> StructuralPartialEq for Wrapping<T>

impl<T> StructuralPartialEq for CachePadded<T>

impl<T> StructuralPartialEq for SendError<T>

impl<T> StructuralPartialEq for PhantomData<T>where T: ?Sized,

impl<T, E> StructuralPartialEq for Result<T, E>

impl<T, const N: usize> StructuralPartialEq for [T; N]

impl<U, T> StructuralPartialEq for (U, T)

impl<V, U, T> StructuralPartialEq for (V, U, T)

impl<W, V, U, T> StructuralPartialEq for (W, V, U, T)

impl<X, W, V, U, T> StructuralPartialEq for (X, W, V, U, T)

impl<Y, R> StructuralPartialEq for GeneratorState<Y, R>

impl<Y, X, W, V, U, T> StructuralPartialEq for (Y, X, W, V, U, T)

impl<Z, Y, X, W, V, U, T> StructuralPartialEq for (Z, Y, X, W, V, U, T)