Enum rustc::ty::Predicate [−][src]
pub enum Predicate<'tcx> { Trait(PolyTraitPredicate<'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.
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 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>
[src]
impl<'a, 'gcx, 'tcx> Predicate<'tcx>
pub fn subst_supertrait(
&self,
tcx: TyCtxt<'a, 'gcx, 'tcx>,
trait_ref: &PolyTraitRef<'tcx>
) -> Predicate<'tcx>
[src]
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>
[src]
impl<'tcx> Predicate<'tcx>
ⓘImportant traits for IntoIter<T>pub fn walk_tys(&self) -> IntoIter<Ty<'tcx>>
[src]
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>>
[src]
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>>
[src]
pub fn to_opt_type_outlives(&self) -> Option<PolyTypeOutlivesPredicate<'tcx>>
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Trait Implementations
impl<'a, 'gcx> HashStable<StableHashingContext<'a>> for Predicate<'gcx>
[src]
impl<'a, 'gcx> HashStable<StableHashingContext<'a>> for Predicate<'gcx>
fn hash_stable<W: StableHasherResult>(
&self,
hcx: &mut StableHashingContext<'a>,
hasher: &mut StableHasher<W>
)
[src]
fn hash_stable<W: StableHasherResult>(
&self,
hcx: &mut StableHashingContext<'a>,
hasher: &mut StableHasher<W>
)
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impl<'gcx, 'tcx> Normalizable<'gcx, 'tcx> for Predicate<'tcx> where
'gcx: 'tcx,
[src]
impl<'gcx, 'tcx> Normalizable<'gcx, 'tcx> for Predicate<'tcx> where
'gcx: 'tcx,
fn type_op_method(
tcx: TyCtxt<'_, 'gcx, 'tcx>,
canonicalized: Canonicalized<'gcx, ParamEnvAnd<'tcx, Normalize<Self>>>
) -> Fallible<CanonicalizedQueryResult<'gcx, Self>>
[src]
fn type_op_method(
tcx: TyCtxt<'_, 'gcx, 'tcx>,
canonicalized: Canonicalized<'gcx, ParamEnvAnd<'tcx, Normalize<Self>>>
) -> Fallible<CanonicalizedQueryResult<'gcx, Self>>
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fn shrink_to_tcx_lifetime<'a>(
v: &'a CanonicalizedQueryResult<'gcx, Self>
) -> &'a Canonical<'tcx, QueryResult<'tcx, Self>>
[src]
fn shrink_to_tcx_lifetime<'a>(
v: &'a CanonicalizedQueryResult<'gcx, Self>
) -> &'a Canonical<'tcx, QueryResult<'tcx, Self>>
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Convert from the 'gcx
(lifted) form of Self
into the tcx
form of Self
. Read more
impl<'tcx> EncodableWithShorthand for Predicate<'tcx>
[src]
impl<'tcx> EncodableWithShorthand for Predicate<'tcx>
type Variant = Predicate<'tcx>
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fn variant(&self) -> &Self::Variant
[src]
fn variant(&self) -> &Self::Variant
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impl<'a, 'tcx> Lift<'tcx> for Predicate<'a>
[src]
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>
[src]
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>
[src]
impl<'tcx> TypeFoldable<'tcx> for Predicate<'tcx>
fn super_fold_with<'gcx: 'tcx, V: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut V
) -> Self
[src]
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
[src]
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
[src]
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
[src]
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
[src]
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. Read more
fn has_regions_bound_above(&self, binder: DebruijnIndex) -> bool
[src]
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). Read more
fn has_escaping_regions(&self) -> bool
[src]
fn has_escaping_regions(&self) -> bool
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fn has_type_flags(&self, flags: TypeFlags) -> bool
[src]
fn has_type_flags(&self, flags: TypeFlags) -> bool
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fn has_projections(&self) -> bool
[src]
fn has_projections(&self) -> bool
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fn references_error(&self) -> bool
[src]
fn references_error(&self) -> bool
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fn has_param_types(&self) -> bool
[src]
fn has_param_types(&self) -> bool
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fn has_self_ty(&self) -> bool
[src]
fn has_self_ty(&self) -> bool
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fn has_infer_types(&self) -> bool
[src]
fn has_infer_types(&self) -> bool
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fn needs_infer(&self) -> bool
[src]
fn needs_infer(&self) -> bool
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fn has_skol(&self) -> bool
[src]
fn has_skol(&self) -> bool
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fn needs_subst(&self) -> bool
[src]
fn needs_subst(&self) -> bool
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fn has_re_skol(&self) -> bool
[src]
fn has_re_skol(&self) -> bool
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fn has_closure_types(&self) -> bool
[src]
fn has_closure_types(&self) -> bool
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fn has_free_regions(&self) -> bool
[src]
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. Read more
fn has_erasable_regions(&self) -> bool
[src]
fn has_erasable_regions(&self) -> bool
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True if there any any un-erased free regions.
fn is_global(&self) -> bool
[src]
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. Read more
fn has_late_bound_regions(&self) -> bool
[src]
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
[src]
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> Clone for Predicate<'tcx>
[src]
impl<'tcx> Clone for Predicate<'tcx>
fn clone(&self) -> Predicate<'tcx>
[src]
fn clone(&self) -> Predicate<'tcx>
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl<'tcx> Copy for Predicate<'tcx>
[src]
impl<'tcx> Copy for Predicate<'tcx>
impl<'tcx> PartialEq for Predicate<'tcx>
[src]
impl<'tcx> PartialEq for Predicate<'tcx>
fn eq(&self, other: &Predicate<'tcx>) -> bool
[src]
fn eq(&self, other: &Predicate<'tcx>) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &Predicate<'tcx>) -> bool
[src]
fn ne(&self, other: &Predicate<'tcx>) -> bool
This method tests for !=
.
impl<'tcx> Eq for Predicate<'tcx>
[src]
impl<'tcx> Eq for Predicate<'tcx>
fn assert_receiver_is_total_eq(&self)
[src]
fn assert_receiver_is_total_eq(&self)
impl<'tcx> Hash for Predicate<'tcx>
[src]
impl<'tcx> Hash for Predicate<'tcx>
fn hash<__H: Hasher>(&self, state: &mut __H)
[src]
fn hash<__H: Hasher>(&self, state: &mut __H)
Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl<'tcx> Encodable for Predicate<'tcx>
[src]
impl<'tcx> Encodable for Predicate<'tcx>
fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>
[src]
fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>
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impl<'tcx> Decodable for Predicate<'tcx>
[src]
impl<'tcx> Decodable for Predicate<'tcx>
fn decode<__D: Decoder>(d: &mut __D) -> Result<Predicate<'tcx>, __D::Error>
[src]
fn decode<__D: Decoder>(d: &mut __D) -> Result<Predicate<'tcx>, __D::Error>
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impl<'tcx> AsRef<Predicate<'tcx>> for Predicate<'tcx>
[src]
impl<'tcx> AsRef<Predicate<'tcx>> for Predicate<'tcx>
impl<'tcx> Print for Predicate<'tcx>
[src]
impl<'tcx> Print for Predicate<'tcx>
fn print<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result
[src]
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
[src]
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
[src]
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
[src]
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
[src]
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
[src]
fn print_debug_to_string(&self, cx: &mut PrintContext) -> String
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impl<'tcx> Display for Predicate<'tcx>
[src]
impl<'tcx> Display for Predicate<'tcx>
fn fmt(&self, f: &mut Formatter) -> Result
[src]
fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl<'tcx> Debug for Predicate<'tcx>
[src]
impl<'tcx> Debug for Predicate<'tcx>