Type Alias ConstKind

pub type ConstKind<'tcx> = ConstKind<TyCtxt<'tcx>>;

Aliased Type

enum ConstKind<'tcx> {
    Param(ParamConst),
    Infer(InferConst),
    Bound(DebruijnIndex, BoundVar),
    Placeholder(Placeholder<BoundVar>),
    Unevaluated(UnevaluatedConst<TyCtxt<'tcx>>),
    Value(Ty<'tcx>, ValTree<'tcx>),
    Error(ErrorGuaranteed),
    Expr(Expr<'tcx>),
}

Variants

Param(ParamConst)

A const generic parameter.

Infer(InferConst)

Infer the value of the const.

Bound(DebruijnIndex, BoundVar)

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

Placeholder(Placeholder<BoundVar>)

A placeholder const - universally quantified higher-ranked const.

Unevaluated(UnevaluatedConst<TyCtxt<'tcx>>)

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(Ty<'tcx>, ValTree<'tcx>)

Used to hold computed value.

Error(ErrorGuaranteed)

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

Expr(Expr<'tcx>)

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

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: 32 bytes

Size for each variant:

• Param: 12 bytes
• Infer: 12 bytes
• Bound: 12 bytes
• Placeholder: 12 bytes
• Unevaluated: 24 bytes
• Value: 32 bytes
• Error: 0 bytes
• Expr: 24 bytes