Struct rustc::ty::ExistentialTraitRef

pub struct ExistentialTraitRef<'tcx> {
    pub def_id: DefId,
    pub substs: &'tcx Substs<'tcx>,
}

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

Fields

def_id: DefId

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substs: &'tcx Substs<'tcx>

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Methods

impl<'a, 'gcx, 'tcx> ExistentialTraitRef<'tcx>

pub fn erase_self_ty(
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    trait_ref: TraitRef<'tcx>
) -> ExistentialTraitRef<'tcx>

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impl<'a, 'gcx, 'tcx> ExistentialTraitRef<'tcx>

pub fn input_types<'b>(
    &'b self
) -> impl DoubleEndedIterator<Item = Ty<'tcx>> + 'b

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pub fn with_self_ty(
    &self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    self_ty: Ty<'tcx>
) -> TraitRef<'tcx>

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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 skolemized type.

Trait Implementations

impl<'tcx> HashStable<StableHashingContext<'tcx>> for ExistentialTraitRef<'tcx>

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

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impl<'gcx> TransNormalize<'gcx> for ExistentialTraitRef<'gcx>

fn trans_normalize<'a, 'tcx>(
    &self,
    infcx: &InferCtxt<'a, 'gcx, 'tcx>,
    param_env: ParamEnv<'tcx>
) -> Self

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impl<'tcx> Relate<'tcx> for ExistentialTraitRef<'tcx>

fn relate<'a, 'gcx, R>(
    relation: &mut R,
    a: &ExistentialTraitRef<'tcx>,
    b: &ExistentialTraitRef<'tcx>
) -> RelateResult<'tcx, ExistentialTraitRef<'tcx>> where
    R: TypeRelation<'a, 'gcx, 'tcx>,
    'gcx: 'a + 'tcx,
    'tcx: 'a, 

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impl<'a, 'tcx> Lift<'tcx> for ExistentialTraitRef<'a>

type Lifted = ExistentialTraitRef<'tcx>

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fn lift_to_tcx<'b, 'gcx>(
    &self,
    tcx: TyCtxt<'b, 'gcx, 'tcx>
) -> Option<Self::Lifted>

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impl<'tcx> TypeFoldable<'tcx> for ExistentialTraitRef<'tcx>

fn super_fold_with<'gcx: 'tcx, V: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut V
) -> Self

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fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut F
) -> Self

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fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn has_regions_escaping_depth(&self, depth: u32) -> bool

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fn has_escaping_regions(&self) -> bool

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fn has_type_flags(&self, flags: TypeFlags) -> bool

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fn has_projections(&self) -> bool

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fn references_error(&self) -> bool

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fn has_param_types(&self) -> bool

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fn has_self_ty(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn needs_infer(&self) -> bool

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fn needs_subst(&self) -> bool

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fn has_re_skol(&self) -> bool

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fn has_closure_types(&self) -> bool

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fn has_erasable_regions(&self) -> bool

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fn is_normalized_for_trans(&self) -> bool

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fn is_global(&self) -> bool

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Indicates whether this value references only 'global' types/lifetimes that are the same regardless of what fn we are in. This is used for caching. Errs on the side of returning false.

impl<'tcx> Copy for ExistentialTraitRef<'tcx>

impl<'tcx> Clone for ExistentialTraitRef<'tcx>

fn clone(&self) -> ExistentialTraitRef<'tcx>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> PartialEq for ExistentialTraitRef<'tcx>

fn eq(&self, __arg_0: &ExistentialTraitRef<'tcx>) -> bool

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

fn ne(&self, __arg_0: &ExistentialTraitRef<'tcx>) -> bool

This method tests for !=.

impl<'tcx> Eq for ExistentialTraitRef<'tcx>

impl<'tcx> Hash for ExistentialTraitRef<'tcx>

fn hash<__H: Hasher>(&self, __arg_0: &mut __H)

Feeds this value into the given [Hasher].

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

Feeds a slice of this type into the given [Hasher].

impl<'tcx> Encodable for ExistentialTraitRef<'tcx>

fn encode<__S: Encoder>(&self, __arg_0: &mut __S) -> Result<(), __S::Error>

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impl<'tcx> Decodable for ExistentialTraitRef<'tcx>

fn decode<__D: Decoder>(
    __arg_0: &mut __D
) -> Result<ExistentialTraitRef<'tcx>, __D::Error>

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impl<'tcx> Print for ExistentialTraitRef<'tcx>

fn print<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_to_string(&self, cx: &mut PrintContext) -> String

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fn print_display<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_display_to_string(&self, cx: &mut PrintContext) -> String

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fn print_debug<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_debug_to_string(&self, cx: &mut PrintContext) -> String

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impl<'tcx> Debug for ExistentialTraitRef<'tcx>

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

Formats the value using the given formatter.