Enum rustc_type_ir::PredicateKind

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pub enum PredicateKind<I: Interner> {
    Clause(ClauseKind<I>),
    ObjectSafe(I::DefId),
    Subtype(I::SubtypePredicate),
    Coerce(I::CoercePredicate),
    ConstEquate(I::Const, I::Const),
    Ambiguous,
    NormalizesTo(I::NormalizesTo),
    AliasRelate(I::Term, I::Term, AliasRelationDirection),
}

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Clause(ClauseKind<I>)

Prove a clause

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ObjectSafe(I::DefId)

Trait must be object-safe.

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Subtype(I::SubtypePredicate)

T1 <: T2

This obligation is created most often when we have two unresolved type variables and hence don’t have enough information to process the subtyping obligation yet.

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Coerce(I::CoercePredicate)

T1 coerced to T2

Like a subtyping obligation, this is created most often when we have two unresolved type variables and hence don’t have enough information to process the coercion obligation yet. At the moment, we actually process coercions very much like subtyping and don’t handle the full coercion logic.

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ConstEquate(I::Const, I::Const)

Constants must be equal. The first component is the const that is expected.

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Ambiguous

A marker predicate that is always ambiguous. Used for coherence to mark opaque types as possibly equal to each other but ambiguous.

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NormalizesTo(I::NormalizesTo)

This should only be used inside of the new solver for AliasRelate and expects the term to be an unconstrained inference variable.

The alias normalizes to term. Unlike Projection, this always fails if the alias cannot be normalized in the current context. For the rigid alias T as Trait>::Assoc, Projection(<T as Trait>::Assoc, ?x) constrains ?x to <T as Trait>::Assoc while NormalizesTo(<T as Trait>::Assoc, ?x) results in NoSolution.

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AliasRelate(I::Term, I::Term, AliasRelationDirection)

Separate from ClauseKind::Projection which is used for normalization in new solver. This predicate requires two terms to be equal to eachother.

Only used for new solver.

Trait Implementations§

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impl<I: Interner> Clone for PredicateKind<I>

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<I: Interner> Debug for PredicateKind<I>

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

Formats the value using the given formatter. Read more
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impl<I: Interner, __D: TyDecoder<I = I>> Decodable<__D> for PredicateKind<I>
where ClauseKind<I>: Decodable<__D>, I::DefId: Decodable<__D>, I::SubtypePredicate: Decodable<__D>, I::CoercePredicate: Decodable<__D>, I::Const: Decodable<__D>, I::NormalizesTo: Decodable<__D>, I::Term: Decodable<__D>,

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fn decode(__decoder: &mut __D) -> Self

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impl<I: Interner, __E: TyEncoder<I = I>> Encodable<__E> for PredicateKind<I>
where ClauseKind<I>: Encodable<__E>, I::DefId: Encodable<__E>, I::SubtypePredicate: Encodable<__E>, I::CoercePredicate: Encodable<__E>, I::Const: Encodable<__E>, I::NormalizesTo: Encodable<__E>, I::Term: Encodable<__E>,

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fn encode(&self, __encoder: &mut __E)

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impl<I: Interner> Hash for PredicateKind<I>

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fn hash<__HI>(&self, __state: &mut __HI)
where __HI: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<I: Interner, __CTX> HashStable<__CTX> for PredicateKind<I>
where ClauseKind<I>: HashStable<__CTX>, I::DefId: HashStable<__CTX>, I::SubtypePredicate: HashStable<__CTX>, I::CoercePredicate: HashStable<__CTX>, I::Const: HashStable<__CTX>, I::NormalizesTo: HashStable<__CTX>, I::Term: HashStable<__CTX>,

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fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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impl<I: Interner> PartialEq for PredicateKind<I>

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<I: Interner> TypeFoldable<I> for PredicateKind<I>

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fn try_fold_with<F: FallibleTypeFolder<I>>( self, folder: &mut F ) -> Result<Self, F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f). Read more
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fn fold_with<F: TypeFolder<I>>(self, folder: &mut F) -> Self

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
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impl<I: Interner> TypeVisitable<I> for PredicateKind<I>

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fn visit_with<V: TypeVisitor<I>>(&self, visitor: &mut V) -> V::Result

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v). Read more
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impl<I: Interner> Copy for PredicateKind<I>

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impl<I: Interner> Eq for PredicateKind<I>

Auto Trait Implementations§

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impl<I> Freeze for PredicateKind<I>

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impl<I> RefUnwindSafe for PredicateKind<I>

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impl<I> Send for PredicateKind<I>

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impl<I> Sync for PredicateKind<I>

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impl<I> Unpin for PredicateKind<I>

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impl<I> UnwindSafe for PredicateKind<I>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<I, T> TypeVisitableExt<I> for T
where I: Interner, T: TypeVisitable<I>,

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

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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.
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fn error_reported(&self) -> Result<(), <I as Interner>::ErrorGuaranteed>

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

Returns true if this type has any regions that escape binder (and hence are not bound by it).
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fn has_escaping_bound_vars(&self) -> bool

Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former. Read more
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fn has_aliases(&self) -> bool

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fn has_inherent_projections(&self) -> bool

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fn has_opaque_types(&self) -> bool

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fn has_coroutines(&self) -> bool

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fn references_error(&self) -> bool

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fn has_non_region_param(&self) -> bool

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fn has_infer_regions(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn has_non_region_infer(&self) -> bool

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fn has_infer(&self) -> bool

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fn has_placeholders(&self) -> bool

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fn has_non_region_placeholders(&self) -> bool

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fn has_param(&self) -> bool

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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.
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fn has_erased_regions(&self) -> bool

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fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.
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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.
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fn has_bound_regions(&self) -> bool

True if there are any late-bound regions
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fn has_non_region_bound_vars(&self) -> bool

True if there are any late-bound non-region variables
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fn has_bound_vars(&self) -> bool

True if there are any bound variables
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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.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.