Predicate in rustc_middle::ty::predicate - Rust
Description: A statement that can be proven by a trait solver. This includes things that may show up in where clauses, such as trait predicates and projection predicates, and also things that are emitted as part of type checking such as `DynCompatible` predicate which is emitted when a type is coerced to a trait object.

Skip to main content

## Predicate

# Struct Predicate

Source

    pub struct Predicate<'tcx>(pub(super) Interned<'tcx, WithCachedTypeInfo<Binder<'tcx, PredicateKind<'tcx>>>>);

Expand description

A statement that can be proven by a trait solver. This includes things that may show up in where clauses, such as trait predicates and projection predicates, and also things that are emitted as part of type checking such as `DynCompatible` predicate which is emitted when a type is coerced to a trait object.

Use this rather than `PredicateKind`, whenever possible.

## Tuple Fields§

§`0: Interned<'tcx, WithCachedTypeInfo<Binder<'tcx, PredicateKind<'tcx>>>>`

## Implementations§

Source§

### impl<'tcx> Predicate<'tcx>

Source

#### pub fn kind(self) -> Binder<'tcx, PredicateKind<'tcx>>

Gets the inner `ty::Binder<'tcx, PredicateKind<'tcx>>`.

Source

#### pub fn flags(self) -> TypeFlags

Source

#### pub fn outer_exclusive_binder(self) -> DebruijnIndex

Source

#### pub fn flip_polarity(self, tcx: TyCtxt<'tcx>) -> Option<Predicate<'tcx>>

Flips the polarity of a Predicate.

Given `T: Trait` predicate it returns `T: !Trait` and given `T: !Trait` returns `T: Trait`.

Source

#### pub fn allow_normalization(self) -> bool

Whether this projection can be soundly normalized.

Wf predicates must not be normalized, as normalization can remove required bounds which would cause us to unsoundly accept some programs. See #91068.

Source§

### impl<'tcx> Predicate<'tcx>

Source

#### pub fn as_trait_clause(self) -> Option<PolyTraitPredicate<'tcx>>

Source

#### pub fn as_projection_clause(self) -> Option<PolyProjectionPredicate<'tcx>>

Source

#### pub fn as_clause(self) -> Option<Clause<'tcx>>

Matches a `PredicateKind::Clause` and turns it into a `Clause`, otherwise returns `None`.

Source

#### pub fn expect_clause(self) -> Clause<'tcx>

Assert that the predicate is a clause.

## Trait Implementations§

Source§

### impl<'tcx> Clone for Predicate<'tcx>

Source§

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

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from `source`. Read more
Source§

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

Source§

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

Formats the value using the given formatter. Read more
Source§

### impl<'tcx, D: TyDecoder<'tcx>> Decodable<D> for Predicate<'tcx>

Source§

#### fn decode(decoder: &mut D) -> Predicate<'tcx>

Source§

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

Source§

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

Formats the value using the given formatter. Read more
Source§

### impl<'tcx> Elaboratable<TyCtxt<'tcx>> for Predicate<'tcx>

Source§

#### fn predicate(&self) -> Predicate<'tcx>

Source§

#### fn child(&self, clause: Clause<'tcx>) -> Self

Source§

#### fn child_with_derived_cause( &self, clause: Clause<'tcx>, _span: Span, _parent_trait_pred: PolyTraitPredicate<'tcx>, _index: usize, ) -> Self

Source§

### impl<'tcx, E: TyEncoder<'tcx>> Encodable<E> for Predicate<'tcx>

Source§

#### fn encode(&self, e: &mut E)

Source§

### impl<'tcx> Flags for Predicate<'tcx>

Source§

#### fn flags(&self) -> TypeFlags

Source§

#### fn outer_exclusive_binder(&self) -> DebruijnIndex

Source§

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

Source§

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

Feeds this value into the given `Hasher`. Read more
1.3.0 · Source§

#### 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
Source§

### impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for Predicate<'tcx>

Source§

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

Source§

### impl<'tcx> IntoDiagArg for Predicate<'tcx>

Source§

#### fn into_diag_arg(self, path: &mut Option<PathBuf>) -> DiagArgValue

Convert `Self` into a `DiagArgValue` suitable for rendering in a diagnostic. Read more
Source§

### impl<'tcx> IntoKind for Predicate<'tcx>

Source§

#### type Kind = Binder<TyCtxt<'tcx>, PredicateKind<TyCtxt<'tcx>>>

Source§

#### fn kind(self) -> Self::Kind

Source§

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

Source§

#### type Lifted = Predicate<'tcx>

Source§

#### fn lift_to_interner(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted>

Source§

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

Source§

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

Tests for `self` and `other` values to be equal, and is used by `==`.
1.0.0 · Source§

#### fn ne(&self, other: &Rhs) -> bool

Tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
Source§

### impl<'tcx> Predicate<TyCtxt<'tcx>> for Predicate<'tcx>

Source§

#### fn as_clause(self) -> Option<Clause<'tcx>>

Source§

#### fn as_normalizes_to(self) -> Option<Binder<I, NormalizesTo<I>>>

Source§

#### fn allow_normalization(self) -> bool

Source§

### impl<'tcx, P: PrettyPrinter<'tcx>> Print<'tcx, P> for Predicate<'tcx>

Source§

#### fn print(&self, p: &mut P) -> Result<(), PrintError>

Source§

### impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for Predicate<'tcx>

Source§

#### fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>( 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
Source§

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

The entry point for folding. To fold a value `t` with a folder `f` call: `t.fold_with(f)`. Read more
Source§

### impl<'tcx> TypeSuperFoldable<TyCtxt<'tcx>> for Predicate<'tcx>

Source§

#### fn try_super_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, folder: &mut F, ) -> Result<Self, F::Error>

Provides a default fold for a recursive type of interest. This should only be called within `TypeFolder` methods, when a non-custom traversal is desired for the value of the type of interest passed to that method. For example, in `MyFolder::try_fold_ty(ty)`, it is valid to call `ty.try_super_fold_with(self)`, but any other folding should be done with `xyz.try_fold_with(self)`.
Source§

#### fn super_fold_with<F: TypeFolder<TyCtxt<'tcx>>>(self, folder: &mut F) -> Self

A convenient alternative to `try_super_fold_with` for use with infallible folders. Do not override this method, to ensure coherence with `try_super_fold_with`.
Source§

### impl<'tcx> TypeSuperVisitable<TyCtxt<'tcx>> for Predicate<'tcx>

Source§

#### fn super_visit_with<V: TypeVisitor<TyCtxt<'tcx>>>( &self, visitor: &mut V, ) -> V::Result

Provides a default visit for a recursive type of interest. This should only be called within `TypeVisitor` methods, when a non-custom traversal is desired for the value of the type of interest passed to that method. For example, in `MyVisitor::visit_ty(ty)`, it is valid to call `ty.super_visit_with(self)`, but any other visiting should be done with `xyz.visit_with(self)`.
Source§

### impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for Predicate<'tcx>

Source§

#### fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>(&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
Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, Binder<TyCtxt<'tcx>, ClauseKind<TyCtxt<'tcx>>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: Binder<'tcx, ClauseKind<'tcx>>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, Binder<TyCtxt<'tcx>, HostEffectPredicate<TyCtxt<'tcx>>>> for Predicate<'tcx>

Source§

#### fn upcast_from( from: Binder<'tcx, HostEffectPredicate<'tcx>>, tcx: TyCtxt<'tcx>, ) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, Binder<TyCtxt<'tcx>, OutlivesPredicate<TyCtxt<'tcx>, Region<'tcx>>>> for Predicate<'tcx>

Source§

#### fn upcast_from( from: PolyRegionOutlivesPredicate<'tcx>, tcx: TyCtxt<'tcx>, ) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, Binder<TyCtxt<'tcx>, PredicateKind<TyCtxt<'tcx>>>> for Predicate<'tcx>

Source§

#### fn upcast_from( from: Binder<'tcx, PredicateKind<'tcx>>, tcx: TyCtxt<'tcx>, ) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, Binder<TyCtxt<'tcx>, ProjectionPredicate<TyCtxt<'tcx>>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: PolyProjectionPredicate<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, Binder<TyCtxt<'tcx>, TraitPredicate<TyCtxt<'tcx>>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: PolyTraitPredicate<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, Binder<TyCtxt<'tcx>, TraitRef<TyCtxt<'tcx>>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: Binder<'tcx, TraitRef<'tcx>>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, Clause<'tcx>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: Clause<'tcx>, _tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, ClauseKind<TyCtxt<'tcx>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: ClauseKind<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, NormalizesTo<TyCtxt<'tcx>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: NormalizesTo<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, OutlivesPredicate<TyCtxt<'tcx>, Region<'tcx>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: RegionOutlivesPredicate<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, OutlivesPredicate<TyCtxt<'tcx>, Ty<'tcx>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: TypeOutlivesPredicate<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, PredicateKind<TyCtxt<'tcx>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: PredicateKind<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, ProjectionPredicate<TyCtxt<'tcx>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: ProjectionPredicate<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, TraitPredicate<TyCtxt<'tcx>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: TraitPredicate<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

### impl<'tcx> UpcastFrom<TyCtxt<'tcx>, TraitRef<TyCtxt<'tcx>>> for Predicate<'tcx>

Source§

#### fn upcast_from(from: TraitRef<'tcx>, tcx: TyCtxt<'tcx>) -> Self

Source§

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

Source§

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

Source§

### impl<'tcx> StructuralPartialEq for Predicate<'tcx>

## Auto Trait Implementations§

§

### impl<'tcx> DynSend for Predicate<'tcx>

§

### impl<'tcx> DynSync for Predicate<'tcx>

§

### impl<'tcx> Freeze for Predicate<'tcx>

§

### impl<'tcx> !RefUnwindSafe for Predicate<'tcx>

§

### impl<'tcx> Send for Predicate<'tcx>

§

### impl<'tcx> Sync for Predicate<'tcx>

§

### impl<'tcx> Unpin for Predicate<'tcx>

§

### impl<'tcx> UnsafeUnpin for Predicate<'tcx>

§

### impl<'tcx> !UnwindSafe for Predicate<'tcx>

## Blanket Implementations§

Source§

### impl<T> Aligned for T

Source§

#### const ALIGN: Alignment

Alignment of `Self`.
Source§

### impl<T> Any for T
where T: 'static + ?Sized,

Source§

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
Source§

### impl<T> AnyEq for T
where T: Any + PartialEq,

Source§

#### fn equals(&self, other: &(dyn Any + 'static)) -> bool

Source§

#### fn as_any(&self) -> &(dyn Any + 'static)

Source§

### impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

Source§

#### fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T

Source§

#### fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]

Source§

### impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

Source§

#### fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T

Source§

#### fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]

Source§

### impl<T> Borrow<T> for T
where T: ?Sized,

Source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

### impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

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

Mutably borrows from an owned value. Read more
Source§

### impl<T> CloneToUninit for T
where T: Clone,

Source§

#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. Read more
Source§

### impl<T, R> CollectAndApply<T, R> for T

Source§

#### 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<_>>())`.

Source§

#### type Output = R

Source§

### impl<'tcx, T> DepNodeKey<'tcx> for T
where T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

Source§

#### default fn key_fingerprint_style() -> KeyFingerprintStyle

Source§

#### default fn to_fingerprint(&self, tcx: TyCtxt<'tcx>) -> Fingerprint

This method turns a query key into an opaque `Fingerprint` to be used in `DepNode`.
Source§

#### default fn try_recover_key(_: TyCtxt<'tcx>, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given `DepNode`, something which is needed when forcing `DepNode`s during red-green evaluation. The query system will only call this method if `fingerprint_style()` is not `FingerprintStyle::Opaque`. It is always valid to return `None` here, in which case incremental compilation will treat the query as having changed instead of forcing it.
Source§

### impl<T> DynClone for T
where T: Clone,

Source§

#### fn __clone_box(&self, _: Private) -> *mut ()

Source§

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

Source§

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

Checks if this value is equivalent to the given key. Read more
Source§

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

Source§

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

Checks if this value is equivalent to the given key. Read more
Source§

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

Source§

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

Compare self to `key` and return `true` if they are equal.
Source§

### impl<T> From<T> for T

Source§

#### fn from(t: T) -> T

Returns the argument unchanged.

Source§

### impl<T> Instrument for T

Source§

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

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
Source§

#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
Source§

### impl<T, U> Into<U> for T
where U: From<T>,

Source§

#### fn into(self) -> U

Calls `U::from(self)`.

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

Source§

### impl<T> IntoEither for T

Source§

#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
Source§

#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
Source§

### impl<K> IntoQueryKey<K> for K

Source§

#### fn into_query_key(self) -> K

Argument conversion from `Self` to `K`. This should always be a very cheap conversion, e.g. `LocalDefId::to_def_id`.
Source§

### impl<'tcx, T> IsSuggestable<'tcx> for T
where T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,

Source§

#### fn is_suggestable(self, tcx: TyCtxt<'tcx>, infer_suggestable: bool) -> bool

Whether this makes sense to suggest in a diagnostic. Read more
Source§

#### fn make_suggestable( self, tcx: TyCtxt<'tcx>, infer_suggestable: bool, placeholder: Option<Ty<'tcx>>, ) -> Option<T>

Source§

### impl<T> MaybeResult<T> for T

Source§

#### type Error = !

Source§

#### fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

Source§

#### fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

Source§

### impl<T> Pointable for T

Source§

#### const ALIGN: usize

The alignment of pointer.
Source§

#### type Init = T

The type for initializers.
Source§

#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
Source§

#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
Source§

#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
Source§

#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
Source§

### impl<T> Same for T

Source§

#### type Output = T

Should always be `Self`
Source§

### impl<T> ToOwned for T
where T: Clone,

Source§

#### type Owned = T

The resulting type after obtaining ownership.
Source§

#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
Source§

#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
Source§

### impl<T> ToString for T
where T: Display + ?Sized,

Source§

#### fn to_string(&self) -> String

Converts the given value to a `String`. Read more
Source§

### impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

#### type Error = Infallible

The type returned in the event of a conversion error.
Source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

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

The type returned in the event of a conversion error.
Source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
Source§

### impl<I, T> TypeVisitableExt<I> for T
where I: Interner, T: TypeVisitable<I>,

Source§

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

Source§

#### 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.
Source§

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

Source§

#### fn non_region_error_reported( &self, ) -> Result<(), <I as Interner>::ErrorGuaranteed>

Source§

#### 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).
Source§

#### 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
Source§

#### fn has_aliases(&self) -> bool

Source§

#### fn has_opaque_types(&self) -> bool

Source§

#### fn has_coroutines(&self) -> bool

Source§

#### fn references_error(&self) -> bool

Source§

#### fn has_non_region_param(&self) -> bool

Source§

#### fn has_infer_regions(&self) -> bool

Source§

#### fn has_infer_types(&self) -> bool

Source§

#### fn has_non_region_infer(&self) -> bool

Source§

#### fn has_infer(&self) -> bool

Source§

#### fn has_placeholders(&self) -> bool

Source§

#### fn has_non_region_placeholders(&self) -> bool

Source§

#### fn has_param(&self) -> bool

Source§

#### 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.
Source§

#### fn has_erased_regions(&self) -> bool

Source§

#### fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.
Source§

#### 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.
Source§

#### fn has_bound_regions(&self) -> bool

True if there are any late-bound regions
Source§

#### fn has_non_region_bound_vars(&self) -> bool

True if there are any late-bound non-region variables
Source§

#### fn has_bound_vars(&self) -> bool

True if there are any bound variables
Source§

#### 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.
Source§

#### fn has_non_region_error(&self) -> bool

True if a type or const error is reachable
Source§

### impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

Source§

#### fn upcast(self, interner: I) -> U

Source§

### impl<I, T> UpcastFrom<I, T> for T

Source§

#### fn upcast_from(from: T, _tcx: I) -> T

Source§

### impl<V, T> VZip<V> for T
where V: MultiLane<T>,

Source§

#### fn vzip(self) -> V

Source§

### impl<T> WithSubscriber for T

Source§

#### 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
Source§

#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
Source§

### impl<T> ErasedDestructor for T
where T: 'static,

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes