pub struct TraitDef {
    pub def_id: DefId,
    pub unsafety: Unsafety,
    pub paren_sugar: bool,
    pub has_auto_impl: bool,
    pub is_marker: bool,
    pub is_coinductive: bool,
    pub skip_array_during_method_dispatch: bool,
    pub specialization_kind: TraitSpecializationKind,
    pub must_implement_one_of: Option<Box<[Ident]>>,
    pub implement_via_object: bool,
    pub deny_explicit_impl: bool,
}
Expand description

A trait’s definition with type information.

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§def_id: DefId§unsafety: Unsafety§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 impls of it are allowed to overlap.

§is_coinductive: bool

If true, then this trait has to #[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.

§skip_array_during_method_dispatch: bool

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

§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.

§implement_via_object: bool

Whether to add a builtin dyn Trait: Trait implementation. This is enabled for all traits except ones marked with #[rustc_deny_explicit_impl(implement_via_object = false)].

§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(implement_via_object = ...)].

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impl<'tcx> TraitDef

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

Trait Implementations§

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impl Debug for TraitDef

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

Formats the value using the given formatter. Read more
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impl<__D: Decoder> Decodable<__D> for TraitDef

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

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impl<__E: Encoder> Encodable<__E> for TraitDef

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

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impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for TraitDef

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fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )

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impl ParameterizedOverTcx for TraitDef

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type Value<'tcx> = TraitDef

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Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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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<_>>()).

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type Output = R

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impl<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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default fn fingerprint_style() -> FingerprintStyle

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default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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default fn to_debug_str(&self, _: Tcx) -> String

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default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes 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.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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impl<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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

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

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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle: &[QueryInfo], _guar: ErrorGuaranteed ) -> T

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: 40 bytes