Enum rustc_trait_selection::infer::canonical::CanonicalVarKind

pub enum CanonicalVarKind<'tcx> {
    Ty(CanonicalTyVarKind),
    PlaceholderTy(Placeholder<BoundTy>),
    Region(UniverseIndex),
    PlaceholderRegion(Placeholder<BoundRegion>),
    Const(UniverseIndex, Ty<'tcx>),
    Effect,
    PlaceholderConst(Placeholder<BoundVar>, Ty<'tcx>),
}

Expand description

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(Placeholder<BoundTy>)

A “placeholder” that represents “any type”.

Region(UniverseIndex)

Region variable '?R.

PlaceholderRegion(Placeholder<BoundRegion>)

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, Ty<'tcx>)

Some kind of const inference variable.

Effect

Effect variable '?E.

PlaceholderConst(Placeholder<BoundVar>, Ty<'tcx>)

A “placeholder” that represents “any const”.

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 Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for Twhere U: From<T>,

fn into(self) -> U

Calls U::from(self).

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

impl<T> ToOwned for Twhere T: Clone,

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

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

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

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

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

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

Performs the conversion.

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.

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

Performs the conversion.

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: 24 bytes

Size for each variant:

Ty: 4 bytes
PlaceholderTy: 20 bytes
Region: 4 bytes
PlaceholderRegion: 20 bytes
Const: 12 bytes
Effect: 0 bytes
PlaceholderConst: 20 bytes