Enum rustc_trait_selection::traits::BuiltinImplSource

pub enum BuiltinImplSource {
    Misc,
    Object {
        vtable_base: usize,
    },
    TraitUpcasting {
        vtable_vptr_slot: Option<usize>,
    },
    TupleUnsizing,
}

Variants

Misc

Some builtin impl we don’t need to differentiate. This should be used unless more specific information is necessary.

Object

Fields

vtable_base: usize

A builtin impl for trait objects.

The vtable is formed by concatenating together the method lists of the base object trait and all supertraits, pointers to supertrait vtable will be provided when necessary; this is the start of upcast_trait_ref’s methods in that vtable.

TraitUpcasting

Fields

vtable_vptr_slot: Option<usize>

The vtable is formed by concatenating together the method lists of the base object trait and all supertraits, pointers to supertrait vtable will be provided when necessary; this is the position of upcast_trait_ref’s vtable within that vtable.

TupleUnsizing

Unsizing a tuple like (A, B, ..., X) to (A, B, ..., Y) if X unsizes to Y.

This needs to be a separate variant as it is still unstable and we need to emit a feature error when using it on stable.

Trait Implementations

impl Clone for BuiltinImplSource

fn clone(&self) -> BuiltinImplSource

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BuiltinImplSource

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

Formats the value using the given formatter.

impl<__D> Decodable<__D> for BuiltinImplSource

where __D: TyDecoder,

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

impl<__E> Encodable<__E> for BuiltinImplSource

where __E: TyEncoder,

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

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

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

impl PartialEq for BuiltinImplSource

fn eq(&self, other: &BuiltinImplSource) -> 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<'tcx> TypeFoldable<TyCtxt<'tcx>> for BuiltinImplSource

fn try_fold_with<F>( self, _: &mut F ) -> Result<BuiltinImplSource, <F as FallibleTypeFolder<TyCtxt<'tcx>>>::Error>

where F: FallibleTypeFolder<TyCtxt<'tcx>>,

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F>(self, _: &mut F) -> BuiltinImplSource

where F: TypeFolder<TyCtxt<'tcx>>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.

impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for BuiltinImplSource

fn visit_with<F>(&self, _: &mut F) -> <F as TypeVisitor<TyCtxt<'tcx>>>::Result

where F: TypeVisitor<TyCtxt<'tcx>>,

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

impl Copy for BuiltinImplSource

impl Eq for BuiltinImplSource

impl StructuralPartialEq for BuiltinImplSource

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: 16 bytes

Size for each variant:

• Misc: 0 bytes
• Object: 16 bytes
• TraitUpcasting: 16 bytes
• TupleUnsizing: 0 bytes