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## ConstKind

# Enum ConstKind

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    pub enum ConstKind<I>where
        I: Interner,{
        Param(<I as Interner>::ParamConst),
        Infer(InferConst),
        Bound(BoundVarIndexKind, BoundConst<I>),
        Placeholder(Placeholder<I, BoundConst<I>>),
        Alias(IsRigid, Alias<I, AliasConstKind<I>>),
        Value(<I as Interner>::ValueConst),
        Error(<I as Interner>::ErrorGuaranteed),
        Expr(<I as Interner>::ExprConst),
    }

Expand description

Represents a constant in Rust.

## Variants§

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### Param(<I as Interner>::ParamConst)

A const generic parameter.

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### Infer(InferConst)

Infer the value of the const.

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### Bound(BoundVarIndexKind, BoundConst<I>)

Bound const variable, used only when preparing a trait query.

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### Placeholder(Placeholder<I, BoundConst<I>>)

A placeholder const - universally quantified higher-ranked const.

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### Alias(IsRigid, Alias<I, AliasConstKind<I>>)

An unnormalized const item such as an anon const or assoc const or free const item. Right now anything other than anon consts does not actually work properly but this should

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### Value(<I as Interner>::ValueConst)

Used to hold computed value.

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### Error(<I as Interner>::ErrorGuaranteed)

A placeholder for a const which could not be computed; this is propagated to avoid useless error messages.

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### Expr(<I as Interner>::ExprConst)

A non-const-item expression awaiting evaluation, used by `feature(generic_const_exprs)` to represent const arguments such as `N + 1` or `foo(N)`

## Trait Implementations§

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### impl<I> Clone for ConstKind<I>
where I: Interner,

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#### fn clone(&self) -> ConstKind<I>

Returns a duplicate 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> Copy for ConstKind<I>
where I: Interner,

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### impl<I> Debug for ConstKind<I>
where I: Interner,

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

Formats the value using the given formatter. Read more
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### impl<I, __D> Decodable<__D> for ConstKind<I>
where I: Interner, __D: Decoder, <I as Interner>::ParamConst: Decodable<__D>, BoundConst<I>: Decodable<__D>, Placeholder<I, BoundConst<I>>: Decodable<__D>, Alias<I, AliasConstKind<I>>: Decodable<__D>, <I as Interner>::ValueConst: Decodable<__D>, <I as Interner>::ErrorGuaranteed: Decodable<__D>, <I as Interner>::ExprConst: Decodable<__D>,

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#### fn decode(__decoder: &mut __D) -> ConstKind<I>

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### impl<I, __E> Encodable<__E> for ConstKind<I>
where I: Interner, __E: Encoder, <I as Interner>::ParamConst: Encodable<__E>, BoundConst<I>: Encodable<__E>, Placeholder<I, BoundConst<I>>: Encodable<__E>, Alias<I, AliasConstKind<I>>: Encodable<__E>, <I as Interner>::ValueConst: Encodable<__E>, <I as Interner>::ErrorGuaranteed: Encodable<__E>, <I as Interner>::ExprConst: Encodable<__E>,

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

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### impl<I> Eq for ConstKind<I>
where I: Interner,

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### impl<I> Hash for ConstKind<I>
where I: Interner,

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#### fn hash<__H>(&self, __state: &mut __H)
where __H: 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> PartialEq for ConstKind<I>
where I: Interner,

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#### fn eq(&self, __other: &ConstKind<I>) -> bool

Equality operator `==`. Read more
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#### fn ne(&self, other: &Rhs) -> bool

Inequality operator `!=`. Read more
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### impl<I> StableHash for ConstKind<I>
where I: Interner, <I as Interner>::ParamConst: StableHash, BoundConst<I>: StableHash, Placeholder<I, BoundConst<I>>: StableHash, Alias<I, AliasConstKind<I>>: StableHash, <I as Interner>::ValueConst: StableHash, <I as Interner>::ErrorGuaranteed: StableHash, <I as Interner>::ExprConst: StableHash,

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#### fn stable_hash<__Hcx>( &self, __hcx: &mut __Hcx, __hasher: &mut StableHasher<SipHasher128>, )
where __Hcx: StableHashCtxt,

## Auto Trait Implementations§

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### impl<I> DynSend for ConstKind<I>
where <I as Interner>::ParamConst: DynSend, <I as Interner>::ValueConst: DynSend, <I as Interner>::ErrorGuaranteed: DynSend, <I as Interner>::ExprConst: DynSend, <I as Interner>::GenericArgs: DynSend, <I as Interner>::TraitAssocConstId: DynSend, <I as Interner>::InherentAssocConstId: DynSend, <I as Interner>::FreeConstAliasId: DynSend, <I as Interner>::AnonConstId: DynSend,

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### impl<I> DynSync for ConstKind<I>
where <I as Interner>::ParamConst: DynSync, <I as Interner>::ValueConst: DynSync, <I as Interner>::ErrorGuaranteed: DynSync, <I as Interner>::ExprConst: DynSync, <I as Interner>::GenericArgs: DynSync, <I as Interner>::TraitAssocConstId: DynSync, <I as Interner>::InherentAssocConstId: DynSync, <I as Interner>::FreeConstAliasId: DynSync, <I as Interner>::AnonConstId: DynSync,

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### impl<I> Freeze for ConstKind<I>
where <I as Interner>::ParamConst: Freeze, <I as Interner>::ValueConst: Freeze, <I as Interner>::ErrorGuaranteed: Freeze, <I as Interner>::ExprConst: Freeze, <I as Interner>::GenericArgs: Freeze, <I as Interner>::TraitAssocConstId: Freeze, <I as Interner>::InherentAssocConstId: Freeze, <I as Interner>::FreeConstAliasId: Freeze, <I as Interner>::AnonConstId: Freeze,

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### impl<I> RefUnwindSafe for ConstKind<I>
where <I as Interner>::ParamConst: RefUnwindSafe, <I as Interner>::ValueConst: RefUnwindSafe, <I as Interner>::ErrorGuaranteed: RefUnwindSafe, <I as Interner>::ExprConst: RefUnwindSafe, <I as Interner>::GenericArgs: RefUnwindSafe, <I as Interner>::TraitAssocConstId: RefUnwindSafe, <I as Interner>::InherentAssocConstId: RefUnwindSafe, <I as Interner>::FreeConstAliasId: RefUnwindSafe, <I as Interner>::AnonConstId: RefUnwindSafe,

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### impl<I> Send for ConstKind<I>
where <I as Interner>::ParamConst: Send, <I as Interner>::ValueConst: Send, <I as Interner>::ErrorGuaranteed: Send, <I as Interner>::ExprConst: Send, <I as Interner>::GenericArgs: Send, <I as Interner>::TraitAssocConstId: Send, <I as Interner>::InherentAssocConstId: Send, <I as Interner>::FreeConstAliasId: Send, <I as Interner>::AnonConstId: Send,

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### impl<I> Sync for ConstKind<I>
where <I as Interner>::ParamConst: Sync, <I as Interner>::ValueConst: Sync, <I as Interner>::ErrorGuaranteed: Sync, <I as Interner>::ExprConst: Sync, <I as Interner>::GenericArgs: Sync, <I as Interner>::TraitAssocConstId: Sync, <I as Interner>::InherentAssocConstId: Sync, <I as Interner>::FreeConstAliasId: Sync, <I as Interner>::AnonConstId: Sync,

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### impl<I> Unpin for ConstKind<I>
where <I as Interner>::ParamConst: Unpin, <I as Interner>::ValueConst: Unpin, <I as Interner>::ErrorGuaranteed: Unpin, <I as Interner>::ExprConst: Unpin, <I as Interner>::GenericArgs: Unpin, <I as Interner>::TraitAssocConstId: Unpin, <I as Interner>::InherentAssocConstId: Unpin, <I as Interner>::FreeConstAliasId: Unpin, <I as Interner>::AnonConstId: Unpin,

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### impl<I> UnsafeUnpin for ConstKind<I>
where <I as Interner>::ParamConst: UnsafeUnpin, <I as Interner>::ValueConst: UnsafeUnpin, <I as Interner>::ErrorGuaranteed: UnsafeUnpin, <I as Interner>::ExprConst: UnsafeUnpin, <I as Interner>::GenericArgs: UnsafeUnpin, <I as Interner>::TraitAssocConstId: UnsafeUnpin, <I as Interner>::InherentAssocConstId: UnsafeUnpin, <I as Interner>::FreeConstAliasId: UnsafeUnpin, <I as Interner>::AnonConstId: UnsafeUnpin,

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### impl<I> UnwindSafe for ConstKind<I>
where <I as Interner>::ParamConst: UnwindSafe, <I as Interner>::ValueConst: UnwindSafe, <I as Interner>::ErrorGuaranteed: UnwindSafe, <I as Interner>::ExprConst: UnwindSafe, <I as Interner>::GenericArgs: UnwindSafe, <I as Interner>::TraitAssocConstId: UnwindSafe, <I as Interner>::InherentAssocConstId: UnwindSafe, <I as Interner>::FreeConstAliasId: UnwindSafe, <I as Interner>::AnonConstId: UnwindSafe,

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

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

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

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

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

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

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

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

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

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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> CloneToUninit for T
where T: Clone,

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#### 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
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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<'tcx, T> DepNodeKey<'tcx> for T
where T: StableHash + Debug,

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

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

This method turns a query key into an opaque `Fingerprint` to be used in `DepNode`.
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#### 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.
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### impl<T> DynClone for T
where T: Clone,

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

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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> ErasedDestructor for T
where T: 'static,

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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> IntoEither for T

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

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#### 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`.
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### impl<T> MaybeResult<T> for T

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#### type Error = !

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

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

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### impl<T> Pointable for T

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#### const ALIGN: usize

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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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, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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

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

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

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

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

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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

## 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.