Struct rustc_middle::infer::canonical::CanonicalVarValues

pub struct CanonicalVarValues<'tcx> {
    pub var_values: IndexVec<BoundVar, GenericArg<'tcx>>,
}

A set of values corresponding to the canonical variables from some Canonical. You can give these values to canonical_value.substitute to substitute them into the canonical value at the right places.

When you canonicalize a value V, you get back one of these vectors with the original values that were replaced by canonical variables. You will need to supply it later to instantiate the canonicalized query response.

Fields

var_values: IndexVec<BoundVar, GenericArg<'tcx>>

Implementations

impl<'tcx> CanonicalVarValues<'tcx>

pub fn len(&self) -> usize

pub fn make_identity(&self, tcx: TyCtxt<'tcx>) -> Self

Makes an identity substitution from this one: each bound var is matched to the same bound var, preserving the original kinds. For example, if we have: self.var_values == [Type(u32), Lifetime('a), Type(u64)] we'll return a substitution subst with: subst.var_values == [Type(^0), Lifetime(^1), Type(^2)].

Trait Implementations

impl<'tcx> Clone for CanonicalVarValues<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Debug for CanonicalVarValues<'tcx>

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

Formats the value using the given formatter.

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

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

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

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

impl<'tcx> Eq for CanonicalVarValues<'tcx>

impl<'tcx> Hash for CanonicalVarValues<'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 CanonicalVarValues<'tcx>

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

impl<'tcx> Index<BoundVar> for CanonicalVarValues<'tcx>

type Output = GenericArg<'tcx>

The returned type after indexing.

pub fn index(&self, value: BoundVar) -> &GenericArg<'tcx>

Performs the indexing (container[index]) operation.

impl<'a, 'tcx> IntoIterator for &'a CanonicalVarValues<'tcx>

type Item = GenericArg<'tcx>

The type of the elements being iterated over.

type IntoIter = Cloned<Iter<'a, GenericArg<'tcx>>>

Which kind of iterator are we turning this into?

pub fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'tcx, '__lifted> Lift<'__lifted> for CanonicalVarValues<'tcx>

type Lifted = CanonicalVarValues<'__lifted>

pub fn lift_to_tcx(
    self,
    __tcx: TyCtxt<'__lifted>
) -> Option<CanonicalVarValues<'__lifted>>

impl<'tcx> PartialEq<CanonicalVarValues<'tcx>> for CanonicalVarValues<'tcx>

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

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

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

This method tests for !=.

impl<'tcx> StructuralEq for CanonicalVarValues<'tcx>

impl<'tcx> StructuralPartialEq for CanonicalVarValues<'tcx>

impl<'tcx> TypeFoldable<'tcx> for CanonicalVarValues<'tcx>

pub fn super_fold_with<__F: TypeFolder<'tcx>>(self, __folder: &mut __F) -> Self

pub fn super_visit_with<__F: TypeVisitor<'tcx>>(
    &self,
    __folder: &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.