Enum rustc_middle::infer::canonical::CanonicalVarKind

pub enum CanonicalVarKind<'tcx> {
    Ty(CanonicalTyVarKind),
    PlaceholderTy(PlaceholderType),
    Region(UniverseIndex),
    PlaceholderRegion(PlaceholderRegion),
    Const(UniverseIndex),
    PlaceholderConst(PlaceholderConst<'tcx>),
}

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)

Some kind of type inference variable.

PlaceholderTy(PlaceholderType)

A "placeholder" that represents "any type".

Region(UniverseIndex)

Region variable '?R.

PlaceholderRegion(PlaceholderRegion)

A "placeholder" that represents "any region". Created when you are solving a goal like for<'a> T: Foo<'a> to represent the bound region 'a.

Const(UniverseIndex)

Some kind of const inference variable.

PlaceholderConst(PlaceholderConst<'tcx>)

A "placeholder" that represents "any const".

Implementations

impl<'tcx> CanonicalVarKind<'tcx>

pub fn universe(self) -> UniverseIndex

Trait Implementations

impl<'tcx> Clone for CanonicalVarKind<'tcx>

pub fn clone(&self) -> CanonicalVarKind<'tcx>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Copy for CanonicalVarKind<'tcx>

impl<'tcx> Debug for CanonicalVarKind<'tcx>

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

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for CanonicalVarKind<'tcx>

pub fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for CanonicalVarKind<'tcx>

pub fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

impl<'tcx> Eq for CanonicalVarKind<'tcx>

impl<'tcx> Hash for CanonicalVarKind<'tcx>

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

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

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

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

type Lifted = Self

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

impl<'tcx> PartialEq<CanonicalVarKind<'tcx>> for CanonicalVarKind<'tcx>

pub fn eq(&self, other: &CanonicalVarKind<'tcx>) -> bool

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

pub fn ne(&self, other: &CanonicalVarKind<'tcx>) -> bool

This method tests for !=.

impl<'tcx> StructuralEq for CanonicalVarKind<'tcx>

impl<'tcx> StructuralPartialEq for CanonicalVarKind<'tcx>

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

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

pub fn super_visit_with<F: TypeVisitor<'tcx>>(
    &self,
    _: &mut F
) -> ControlFlow<F::BreakTy>

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

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

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

Returns 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.

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

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

pub fn has_escaping_bound_vars(&self) -> bool

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

pub fn has_projections(&self) -> bool

pub fn has_opaque_types(&self) -> bool

pub fn references_error(&self) -> bool

pub fn has_param_types_or_consts(&self) -> bool

pub fn has_infer_regions(&self) -> bool

pub fn has_infer_types(&self) -> bool

pub fn has_infer_types_or_consts(&self) -> bool

pub fn needs_infer(&self) -> bool

pub fn has_placeholders(&self) -> bool

pub fn needs_subst(&self) -> bool

pub fn has_free_regions(&self) -> bool

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

pub fn has_erased_regions(&self) -> bool

pub fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

pub fn is_global(&self) -> bool

Indicates whether this value references only 'global' generic parameters that are the same regardless of what fn we are in. This is used for caching.

pub fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

pub fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.