Enum rustc::infer::canonical::CanonicalVarKind

pub enum CanonicalVarKind {
    Ty(CanonicalTyVarKind),
    Region,
}

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Describes the "kind" of the canonical variable. This is a "kind" in the type-theory sense of the term -- i.e., a "meta" type system that analyzes type-like values.

Variants

Ty(CanonicalTyVarKind)

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Some kind of type inference variable.

Region

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Region variable '?R.

Trait Implementations

impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for CanonicalVarKind

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

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impl Copy for CanonicalVarKind

impl Clone for CanonicalVarKind

fn clone(&self) -> CanonicalVarKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CanonicalVarKind

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

Formats the value using the given formatter.

impl PartialEq for CanonicalVarKind

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

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

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

This method tests for !=.

impl Eq for CanonicalVarKind

fn assert_receiver_is_total_eq(&self)

impl Hash for CanonicalVarKind

fn hash<__H: Hasher>(&self, state: &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 Decodable for CanonicalVarKind

fn decode<__D: Decoder>(d: &mut __D) -> Result<CanonicalVarKind, __D::Error>

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impl Encodable for CanonicalVarKind

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

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impl<'tcx> TypeFoldable<'tcx> for CanonicalVarKind

fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(     &self,     _: &mut F ) -> CanonicalVarKind

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fn super_visit_with<F: TypeVisitor<'tcx>>(&self, _: &mut F) -> 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_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

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True if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.

fn has_regions_bound_above(&self, binder: DebruijnIndex) -> bool

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True if this self has any regions that escape binder (and hence are not bound by it).

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 has_skol(&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_free_regions(&self) -> bool

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"Free" regions in this context means that it has any region that is not (a) erased or (b) late-bound.

fn has_erasable_regions(&self) -> bool

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True if there any any un-erased free regions.

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.

fn has_late_bound_regions(&self) -> bool

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True if there are any late-bound regions

fn visit_tys_shallow(     &self,     visit: impl FnMut(Ty<'tcx>) -> bool ) -> bool

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A visitor that does not recurse into types, works like fn walk_shallow in Ty.

impl<'tcx> Lift<'tcx> for CanonicalVarKind

type Lifted = Self

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

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