Struct ExistentialTraitRef

pub struct ExistentialTraitRef<I>
where
    I: Interner,
{
    pub def_id: <I as Interner>::DefId,
    pub args: <I as Interner>::GenericArgs,
}

An existential reference to a trait, where Self is erased. For example, the trait object Trait<'a, 'b, X, Y> is:

exists T. T: Trait<'a, 'b, X, Y>

The generic parameters don’t include the erased Self, only trait type and lifetime parameters ([X, Y] and ['a, 'b] above).

Fields

def_id: <I as Interner>::DefId

args: <I as Interner>::GenericArgs

Implementations

impl<I> ExistentialTraitRef<I>

where I: Interner,

pub fn erase_self_ty( interner: I, trait_ref: TraitRef<I>, ) -> ExistentialTraitRef<I>

pub fn with_self_ty( self, interner: I, self_ty: <I as Interner>::Ty, ) -> TraitRef<I>

Object types don’t have a self type specified. Therefore, when we convert the principal trait-ref into a normal trait-ref, you must give some self type. A common choice is mk_err() or some placeholder type.

Trait Implementations

impl<I> Clone for ExistentialTraitRef<I>

where I: Interner,

fn clone(&self) -> ExistentialTraitRef<I>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<I> Debug for ExistentialTraitRef<I>

where I: Interner,

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

Formats the value using the given formatter.

impl<I, __D> Decodable<__D> for ExistentialTraitRef<I>

where I: Interner, __D: TyDecoder<I = I>, <I as Interner>::DefId: Decodable<__D>, <I as Interner>::GenericArgs: Decodable<__D>,

fn decode(__decoder: &mut __D) -> ExistentialTraitRef<I>

impl<I> Display for ExistentialTraitRef<I>

where I: Interner,

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

Formats the value using the given formatter.

impl<I, __E> Encodable<__E> for ExistentialTraitRef<I>

where I: Interner, __E: TyEncoder<I = I>, <I as Interner>::DefId: Encodable<__E>, <I as Interner>::GenericArgs: Encodable<__E>,

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

impl<'tcx> EraseType for ExistentialTraitRef<TyCtxt<'tcx>>

type Result = [u8; 16]

impl<I> Hash for ExistentialTraitRef<I>

where I: Interner,

fn hash<__H>(&self, __state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<I, __CTX> HashStable<__CTX> for ExistentialTraitRef<I>

where I: Interner, <I as Interner>::DefId: HashStable<__CTX>, <I as Interner>::GenericArgs: HashStable<__CTX>,

fn hash_stable( &self, __hcx: &mut __CTX, __hasher: &mut StableHasher<SipHasher128>, )

impl<I> IntoDiagArg for ExistentialTraitRef<I>

where I: Interner,

fn into_diag_arg(self) -> DiagArgValue

impl<I, J> Lift<J> for ExistentialTraitRef<I>

where I: Interner, J: Interner, <I as Interner>::DefId: Lift<J, Lifted = <J as Interner>::DefId>, <I as Interner>::GenericArgs: Lift<J, Lifted = <J as Interner>::GenericArgs>,

type Lifted = ExistentialTraitRef<J>

fn lift_to_interner(self, interner: J) -> Option<ExistentialTraitRef<J>>

impl<I> PartialEq for ExistentialTraitRef<I>

where I: Interner,

fn eq(&self, __other: &ExistentialTraitRef<I>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

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

impl<'tcx, P> Print<'tcx, P> for ExistentialTraitRef<TyCtxt<'tcx>>

where P: PrettyPrinter<'tcx>,

fn print(&self, cx: &mut P) -> Result<(), Error>

impl<I> Relate<I> for ExistentialTraitRef<I>

where I: Interner,

fn relate<R>( relation: &mut R, a: ExistentialTraitRef<I>, b: ExistentialTraitRef<I>, ) -> Result<ExistentialTraitRef<I>, TypeError<I>>

where R: TypeRelation<I>,

impl<I> TypeFoldable<I> for ExistentialTraitRef<I>

where I: Interner, <I as Interner>::DefId: TypeFoldable<I>, <I as Interner>::GenericArgs: TypeFoldable<I>,

fn try_fold_with<__F>( self, __folder: &mut __F, ) -> Result<ExistentialTraitRef<I>, <__F as FallibleTypeFolder<I>>::Error>

where __F: FallibleTypeFolder<I>,

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, folder: &mut F) -> Self

where F: TypeFolder<I>,

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<I> TypeVisitable<I> for ExistentialTraitRef<I>

where I: Interner, <I as Interner>::DefId: TypeVisitable<I>, <I as Interner>::GenericArgs: TypeVisitable<I>,

fn visit_with<__V>( &self, __visitor: &mut __V, ) -> <__V as TypeVisitor<I>>::Result

where __V: TypeVisitor<I>,

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

impl<I> Copy for ExistentialTraitRef<I>

where I: Interner,

impl<I> Eq for ExistentialTraitRef<I>

where I: Interner,

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.