Enum ConstKind

pub enum ConstKind<I: Interner> {
    Param(I::ParamConst),
    Infer(InferConst),
    Bound(DebruijnIndex, I::BoundConst),
    Placeholder(I::PlaceholderConst),
    Unevaluated(UnevaluatedConst<I>),
    Value(I::Ty, I::ValueConst),
    Error(I::ErrorGuaranteed),
    Expr(I::ExprConst),
}

Represents a constant in Rust.

Variants

Param(I::ParamConst)

A const generic parameter.

Infer(InferConst)

Infer the value of the const.

Bound(DebruijnIndex, I::BoundConst)

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

Placeholder(I::PlaceholderConst)

A placeholder const - universally quantified higher-ranked const.

Unevaluated(UnevaluatedConst<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

Value(I::Ty, I::ValueConst)

Used to hold computed value.

Error(I::ErrorGuaranteed)

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

Expr(I::ExprConst)

Unevaluated non-const-item, used by feature(generic_const_exprs) to represent const arguments such as N + 1 or foo(N)

Trait Implementations

impl<I> Clone for ConstKind<I>

where I: Interner,

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<I: Interner> Debug for ConstKind<I>

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

Formats the value using the given formatter.

impl<I: Interner, __D: TyDecoder<I = I>> Decodable<__D> for ConstKind<I>

where I::ParamConst: Decodable<__D>, I::BoundConst: Decodable<__D>, I::PlaceholderConst: Decodable<__D>, UnevaluatedConst<I>: Decodable<__D>, I::Ty: Decodable<__D>, I::ValueConst: Decodable<__D>, I::ErrorGuaranteed: Decodable<__D>, I::ExprConst: Decodable<__D>,

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

impl<I: Interner, __E: TyEncoder<I = I>> Encodable<__E> for ConstKind<I>

where I::ParamConst: Encodable<__E>, I::BoundConst: Encodable<__E>, I::PlaceholderConst: Encodable<__E>, UnevaluatedConst<I>: Encodable<__E>, I::Ty: Encodable<__E>, I::ValueConst: Encodable<__E>, I::ErrorGuaranteed: Encodable<__E>, I::ExprConst: Encodable<__E>,

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

impl<I> Hash for ConstKind<I>

where I: Interner,

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<I: Interner, __CTX> HashStable<__CTX> for ConstKind<I>

where I::ParamConst: HashStable<__CTX>, I::BoundConst: HashStable<__CTX>, I::PlaceholderConst: HashStable<__CTX>, UnevaluatedConst<I>: HashStable<__CTX>, I::Ty: HashStable<__CTX>, I::ValueConst: HashStable<__CTX>, I::ErrorGuaranteed: HashStable<__CTX>, I::ExprConst: HashStable<__CTX>,

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

impl<I> PartialEq for ConstKind<I>

where I: Interner,

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl<I> Copy for ConstKind<I>

where I: Interner,

impl<I> Eq for ConstKind<I>

where I: Interner,

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.