Enum rustc::ty::Predicate

pub enum Predicate<'tcx> {
    Trait(PolyTraitPredicate<'tcx>),
    Equate(PolyEquatePredicate<'tcx>),
    RegionOutlives(PolyRegionOutlivesPredicate<'tcx>),
    TypeOutlives(PolyTypeOutlivesPredicate<'tcx>),
    Projection(PolyProjectionPredicate<'tcx>),
    WellFormed(Ty<'tcx>),
    ObjectSafe(DefId),
    ClosureKind(DefId, ClosureSubsts<'tcx>, ClosureKind),
    Subtype(PolySubtypePredicate<'tcx>),
    ConstEvaluatable(DefId, &'tcx Substs<'tcx>),
}

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Variants

Trait(PolyTraitPredicate<'tcx>)

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Corresponds to where Foo : Bar<A,B,C>. Foo here would be the Self type of the trait reference and A, B, and C would be the type parameters.

Equate(PolyEquatePredicate<'tcx>)

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where T1 == T2.

RegionOutlives(PolyRegionOutlivesPredicate<'tcx>)

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where 'a : 'b

TypeOutlives(PolyTypeOutlivesPredicate<'tcx>)

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where T : 'a

Projection(PolyProjectionPredicate<'tcx>)

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where ::Name == X, approximately. See ProjectionPredicate struct for details.

WellFormed(Ty<'tcx>)

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no syntax: T WF

ObjectSafe(DefId)

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trait must be object-safe

ClosureKind(DefId, ClosureSubsts<'tcx>, ClosureKind)

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No direct syntax. May be thought of as where T : FnFoo<...> for some substitutions ... and T being a closure type. Satisfied (or refuted) once we know the closure's kind.

Subtype(PolySubtypePredicate<'tcx>)

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T1 <: T2

ConstEvaluatable(DefId, &'tcx Substs<'tcx>)

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Constant initializer must evaluate successfully.

Methods

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

pub fn subst_supertrait(
    &self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    trait_ref: &PolyTraitRef<'tcx>
) -> Predicate<'tcx>

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Performs a substitution suitable for going from a poly-trait-ref to supertraits that must hold if that poly-trait-ref holds. This is slightly different from a normal substitution in terms of what happens with bound regions. See lengthy comment below for details.

impl<'tcx> Predicate<'tcx>

Important traits for IntoIter<T>

impl<T> Iterator for IntoIter<T> type Item = T;

pub fn walk_tys(&self) -> IntoIter<Ty<'tcx>>

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Iterates over the types in this predicate. Note that in all cases this is skipping over a binder, so late-bound regions with depth 0 are bound by the predicate.

pub fn to_opt_poly_trait_ref(&self) -> Option<PolyTraitRef<'tcx>>

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pub fn to_opt_type_outlives(&self) -> Option<PolyTypeOutlivesPredicate<'tcx>>

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Trait Implementations

impl<'gcx> HashStable<StableHashingContext<'gcx>> for Predicate<'gcx>

fn hash_stable<W: StableHasherResult>(
    &self,
    hcx: &mut StableHashingContext<'gcx>,
    hasher: &mut StableHasher<W>
)

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impl<'tcx> EncodableWithShorthand for Predicate<'tcx>

type Variant = Predicate<'tcx>

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fn variant(&self) -> &Self::Variant

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

type Lifted = Predicate<'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 Predicate<'tcx>

fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut F
) -> 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> Clone for Predicate<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Copy for Predicate<'tcx>

impl<'tcx> PartialEq for Predicate<'tcx>

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

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

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

This method tests for !=.

impl<'tcx> Eq for Predicate<'tcx>

impl<'tcx> Hash for Predicate<'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 Predicate<'tcx>

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

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impl<'tcx> Decodable for Predicate<'tcx>

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

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impl<'tcx> AsRef<Predicate<'tcx>> for Predicate<'tcx>

fn as_ref(&self) -> &Predicate<'tcx>

Performs the conversion.

impl<'tcx> Print for Predicate<'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> Display for Predicate<'tcx>

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

Formats the value using the given formatter.

impl<'tcx> Debug for Predicate<'tcx>

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

Formats the value using the given formatter.