Enum rustc_middle::infer::canonical::CanonicalVarKind[][src]

pub enum CanonicalVarKind<'tcx> {
    Ty(CanonicalTyVarKind),
    PlaceholderTy(PlaceholderType),
    Region(UniverseIndex),
    PlaceholderRegion(PlaceholderRegion),
    Const(UniverseIndex),
    PlaceholderConst(PlaceholderConst<'tcx>),
}

Describes the “kind” of the canonical variable. This is a “kind” in the type-theory sense of the term – i.e., a “meta” type system that analyzes type-like values.

Variants

Ty(CanonicalTyVarKind)

Some kind of type inference variable.

PlaceholderTy(PlaceholderType)

A “placeholder” that represents “any type”.

Region(UniverseIndex)

Region variable '?R.

PlaceholderRegion(PlaceholderRegion)

A “placeholder” that represents “any region”. Created when you are solving a goal like for<'a> T: Foo<'a> to represent the bound region 'a.

Const(UniverseIndex)

Some kind of const inference variable.

PlaceholderConst(PlaceholderConst<'tcx>)

A “placeholder” that represents “any const”.

Implementations

impl<'tcx> CanonicalVarKind<'tcx>[src]

pub fn universe(self) -> UniverseIndex[src]

Trait Implementations

impl<'tcx> Clone for CanonicalVarKind<'tcx>[src]

impl<'tcx> Copy for CanonicalVarKind<'tcx>[src]

impl<'tcx> Debug for CanonicalVarKind<'tcx>[src]

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for CanonicalVarKind<'tcx>[src]

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for CanonicalVarKind<'tcx>[src]

impl<'tcx> Eq for CanonicalVarKind<'tcx>[src]

impl<'tcx> Hash for CanonicalVarKind<'tcx>[src]

impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for CanonicalVarKind<'tcx>[src]

impl<'tcx> Lift<'tcx> for CanonicalVarKind<'tcx>[src]

type Lifted = Self

impl<'tcx> PartialEq<CanonicalVarKind<'tcx>> for CanonicalVarKind<'tcx>[src]

impl<'tcx> StructuralEq for CanonicalVarKind<'tcx>[src]

impl<'tcx> StructuralPartialEq for CanonicalVarKind<'tcx>[src]

impl<'tcx> TypeFoldable<'tcx> for CanonicalVarKind<'tcx>[src]

Auto Trait Implementations

impl<'tcx> !RefUnwindSafe for CanonicalVarKind<'tcx>

impl<'tcx> !Send for CanonicalVarKind<'tcx>

impl<'tcx> !Sync for CanonicalVarKind<'tcx>

impl<'tcx> Unpin for CanonicalVarKind<'tcx>

impl<'tcx> !UnwindSafe for CanonicalVarKind<'tcx>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<'tcx, T> ArenaAllocatable<'tcx, ()> for T where
    T: Copy
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<'a, T> Captures<'a> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> MaybeResult<T> for T[src]

type Error = !

impl<'tcx, T> Subst<'tcx> for T where
    T: TypeFoldable<'tcx>, 
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.

impl<T> WithConstness for T[src]