Enum rustc_middle::ty::trait_def::TraitSpecializationKind

pub enum TraitSpecializationKind {
    None,
    Marker,
    AlwaysApplicable,
}

Whether this trait is treated specially by the standard library specialization lint.

Variants

None

The default. Specializing on this trait is not allowed.

Marker

Specializing on this trait is allowed because it doesn’t have any methods. For example Sized or FusedIterator. Applies to traits with the rustc_unsafe_specialization_marker attribute.

AlwaysApplicable

Specializing on this trait is allowed because all of the impls of this trait are “always applicable”. Always applicable means that if X<'x>: T<'y> for any lifetimes, then for<'a, 'b> X<'a>: T<'b>. Applies to traits with the rustc_specialization_trait attribute.

Trait Implementations

impl Clone for TraitSpecializationKind

fn clone(&self) -> TraitSpecializationKind

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<__D: Decoder> Decodable<__D> for TraitSpecializationKind

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

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

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

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

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

impl PartialEq<TraitSpecializationKind> for TraitSpecializationKind

fn eq(&self, other: &TraitSpecializationKind) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for TraitSpecializationKind

impl StructuralPartialEq for TraitSpecializationKind

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: 1 byte

Size for each variant:

• None: 0 bytes
• Marker: 0 bytes
• AlwaysApplicable: 0 bytes