TraitDef in rustc_middle::ty::trait_def - Rust
Description: A trait’s definition with type information.

Skip to main content

## TraitDef

# Struct TraitDef

Source

    pub struct TraitDef {Show 15 fields
        pub def_id: DefId,
        pub impl_restriction: ImplRestrictionKind,
        pub safety: Safety,
        pub constness: Constness,
        pub paren_sugar: bool,
        pub has_auto_impl: bool,
        pub is_marker: bool,
        pub is_coinductive: bool,
        pub is_fundamental: bool,
        pub skip_array_during_method_dispatch: bool,
        pub skip_boxed_slice_during_method_dispatch: bool,
        pub specialization_kind: TraitSpecializationKind,
        pub must_implement_one_of: Option<Box<[Ident]>>,
        pub force_dyn_incompatible: Option<Span>,
        pub deny_explicit_impl: bool,
    }

Expand description

A trait’s definition with type information.

## Fields§

§`def_id: DefId`§`impl_restriction: ImplRestrictionKind`

Restrictions on trait implementations.

§`safety: Safety`§`constness: Constness`

Whether this trait is `const`.

§`paren_sugar: bool`

If `true`, then this trait had the `#[rustc_paren_sugar]` attribute, indicating that it should be used with `Foo()` sugar. This is a temporary thing – eventually any trait will be usable with the sugar (or without it).

§`has_auto_impl: bool`§`is_marker: bool`

If `true`, then this trait has the `#[marker]` attribute, indicating that all its associated items have defaults that cannot be overridden, and thus `impl`s of it are allowed to overlap.

§`is_coinductive: bool`

If `true`, then this trait has the `#[rustc_coinductive]` attribute or is an auto trait. This indicates that trait solver cycles involving an `X: ThisTrait` goal are accepted.

In the future all traits should be coinductive, but we need a better formal understanding of what exactly that means and should probably also have already switched to the new trait solver.

§`is_fundamental: bool`

If `true`, then this trait has the `#[fundamental]` attribute. This affects how conherence computes whether a trait may have trait implementations added in the future.

§`skip_array_during_method_dispatch: bool`

If `true`, then this trait has the `#[rustc_skip_during_method_dispatch(array)]` attribute, indicating that editions before 2021 should not consider this trait during method dispatch if the receiver is an array.

§`skip_boxed_slice_during_method_dispatch: bool`

If `true`, then this trait has the `#[rustc_skip_during_method_dispatch(boxed_slice)]` attribute, indicating that editions before 2024 should not consider this trait during method dispatch if the receiver is a boxed slice.

§`specialization_kind: TraitSpecializationKind`

Used to determine whether the standard library is allowed to specialize on this trait.

§`must_implement_one_of: Option<Box<[Ident]>>`

List of functions from `#[rustc_must_implement_one_of]` attribute one of which must be implemented.

§`force_dyn_incompatible: Option<Span>`

Whether the trait should be considered dyn-incompatible, even if it otherwise satisfies the requirements to be dyn-compatible.

§`deny_explicit_impl: bool`

Whether a trait is fully built-in, and any implementation is disallowed. This only applies to built-in traits, and is marked via `#[rustc_deny_explicit_impl]`.

## Implementations§

Source§

### impl<'tcx> TraitDef

Source

#### pub fn ancestors( &self, tcx: TyCtxt<'tcx>, of_impl: DefId, ) -> Result<Ancestors<'tcx>, ErrorGuaranteed>

## Trait Implementations§

Source§

### impl Debug for TraitDef

Source§

#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
Source§

### impl<__D: SpanDecoder> Decodable<__D> for TraitDef

Source§

#### fn decode(__decoder: &mut __D) -> Self

Source§

### impl<__E: SpanEncoder> Encodable<__E> for TraitDef

Source§

#### fn encode(&self, __encoder: &mut __E)

Source§

### impl StableHash for TraitDef

Source§

#### fn stable_hash<__Hcx: StableHashCtxt>( &self, __hcx: &mut __Hcx, __hasher: &mut StableHasher, )

## Auto Trait Implementations§

§

### impl DynSend for TraitDef

§

### impl DynSync for TraitDef

§

### impl Freeze for TraitDef

§

### impl RefUnwindSafe for TraitDef

§

### impl Send for TraitDef

§

### impl Sync for TraitDef

§

### impl Unpin for TraitDef

§

### impl UnsafeUnpin for TraitDef

§

### impl UnwindSafe for TraitDef

## Blanket Implementations§

Source§

### impl<T> Aligned for T

Source§

#### const ALIGN: Alignment

Alignment of `Self`.
Source§

### impl<T> Any for T
where T: 'static + ?Sized,

Source§

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
Source§

### impl<T> Borrow<T> for T
where T: ?Sized,

Source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

### impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

### impl<T, R> CollectAndApply<T, R> for T

Source§

#### fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to `f(&iter.collect::<Vec<_>>())`.

Source§

#### type Output = R

Source§

### impl<'tcx, T> DepNodeKey<'tcx> for T
where T: StableHash + Debug,

Source§

#### default fn key_fingerprint_style() -> KeyFingerprintStyle

Source§

#### default fn to_fingerprint(&self, tcx: TyCtxt<'tcx>) -> Fingerprint

This method turns a query key into an opaque `Fingerprint` to be used in `DepNode`.
Source§

#### default fn try_recover_key(_: TyCtxt<'tcx>, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given `DepNode`, something which is needed when forcing `DepNode`s during red-green evaluation. The query system will only call this method if `fingerprint_style()` is not `FingerprintStyle::Opaque`. It is always valid to return `None` here, in which case incremental compilation will treat the query as having changed instead of forcing it.
Source§

### impl<T> ErasedDestructor for T
where T: 'static,

Source§

### impl<T> From<T> for T

Source§

#### fn from(t: T) -> T

Returns the argument unchanged.

Source§

### impl<T> Instrument for T

Source§

#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
Source§

#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
Source§

### impl<T, U> Into<U> for T
where U: From<T>,

Source§

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

Source§

### impl<T> IntoEither for T

Source§

#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
Source§

#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
Source§

### impl<K> IntoQueryKey<K> for K

Source§

#### fn into_query_key(self) -> K

Argument conversion from `Self` to `K`. This should always be a very cheap conversion, e.g. `LocalDefId::to_def_id`.
Source§

### impl<T> MaybeResult<T> for T

Source§

#### type Error = !

Source§

#### fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

Source§

#### fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

Source§

### impl<T> Pointable for T

Source§

#### const ALIGN: usize

The alignment of pointer.
Source§

#### type Init = T

The type for initializers.
Source§

#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
Source§

#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
Source§

#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
Source§

#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
Source§

### impl<T> Same for T

Source§

#### type Output = T

Should always be `Self`
Source§

### impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

#### type Error = Infallible

The type returned in the event of a conversion error.
Source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
Source§

### impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

Source§

#### fn upcast(self, interner: I) -> U

Source§

### impl<I, T> UpcastFrom<I, T> for T

Source§

#### fn upcast_from(from: T, _tcx: I) -> T

Source§

### impl<V, T> VZip<V> for T
where V: MultiLane<T>,

Source§

#### fn vzip(self) -> V

Source§

### impl<T> WithSubscriber for T

Source§

#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
Source§

#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 64 bytes