Struct TraitDef

pub struct TraitDef {

    pub def_id: DefId,
    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 implement_via_object: bool,
    pub deny_explicit_impl: bool,
}

A trait’s definition with type information.

Fields

def_id: DefId

safety: Safety

constness: Constness

Whether this trait has been annotated with #[const_trait].

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 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.

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 = ...)].

Implementations

impl<'tcx> TraitDef

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

Trait Implementations

impl Debug for TraitDef

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

Formats the value using the given formatter.

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

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

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

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

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

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

impl ParameterizedOverTcx for TraitDef

type Value<'tcx> = TraitDef

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