pub enum CanonicalVarKind<I: Interner> {
Ty(CanonicalTyVarKind),
PlaceholderTy(I::PlaceholderTy),
Region(UniverseIndex),
PlaceholderRegion(I::PlaceholderRegion),
Const(UniverseIndex),
PlaceholderConst(I::PlaceholderConst),
}
Expand description
Information about a canonical variable that is included with the canonical value. This is sufficient information for code to create a copy of the canonical value in some other inference context, with fresh inference variables replacing the canonical values.
Variants§
Ty(CanonicalTyVarKind)
Some kind of type inference variable.
PlaceholderTy(I::PlaceholderTy)
A “placeholder” that represents “any type”.
Region(UniverseIndex)
Region variable '?R
.
PlaceholderRegion(I::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(I::PlaceholderConst)
A “placeholder” that represents “any const”.
Implementations§
Source§impl<I: Interner> CanonicalVarKind<I>
impl<I: Interner> CanonicalVarKind<I>
pub fn universe(self) -> UniverseIndex
Sourcepub fn with_updated_universe(self, ui: UniverseIndex) -> CanonicalVarKind<I>
pub fn with_updated_universe(self, ui: UniverseIndex) -> CanonicalVarKind<I>
Replaces the universe of this canonical variable with ui
.
In case this is a float or int variable, this causes an ICE if the updated universe is not the root.
pub fn is_existential(self) -> bool
pub fn is_region(self) -> bool
pub fn expect_placeholder_index(self) -> usize
Trait Implementations§
Source§impl<I> Clone for CanonicalVarKind<I>where
I: Interner,
impl<I> Clone for CanonicalVarKind<I>where
I: Interner,
Source§impl<I> Debug for CanonicalVarKind<I>where
I: Interner,
impl<I> Debug for CanonicalVarKind<I>where
I: Interner,
Source§impl<I: Interner, __D: Decoder> Decodable<__D> for CanonicalVarKind<I>where
I::PlaceholderTy: Decodable<__D>,
I::PlaceholderRegion: Decodable<__D>,
I::PlaceholderConst: Decodable<__D>,
impl<I: Interner, __D: Decoder> Decodable<__D> for CanonicalVarKind<I>where
I::PlaceholderTy: Decodable<__D>,
I::PlaceholderRegion: Decodable<__D>,
I::PlaceholderConst: Decodable<__D>,
Source§impl<I: Interner, __E: Encoder> Encodable<__E> for CanonicalVarKind<I>where
I::PlaceholderTy: Encodable<__E>,
I::PlaceholderRegion: Encodable<__E>,
I::PlaceholderConst: Encodable<__E>,
impl<I: Interner, __E: Encoder> Encodable<__E> for CanonicalVarKind<I>where
I::PlaceholderTy: Encodable<__E>,
I::PlaceholderRegion: Encodable<__E>,
I::PlaceholderConst: Encodable<__E>,
Source§impl<I> Hash for CanonicalVarKind<I>where
I: Interner,
impl<I> Hash for CanonicalVarKind<I>where
I: Interner,
Source§impl<I: Interner, __CTX> HashStable<__CTX> for CanonicalVarKind<I>where
I::PlaceholderTy: HashStable<__CTX>,
I::PlaceholderRegion: HashStable<__CTX>,
I::PlaceholderConst: HashStable<__CTX>,
impl<I: Interner, __CTX> HashStable<__CTX> for CanonicalVarKind<I>where
I::PlaceholderTy: HashStable<__CTX>,
I::PlaceholderRegion: HashStable<__CTX>,
I::PlaceholderConst: HashStable<__CTX>,
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
Source§impl<I> PartialEq for CanonicalVarKind<I>where
I: Interner,
impl<I> PartialEq for CanonicalVarKind<I>where
I: Interner,
impl<I> Copy for CanonicalVarKind<I>where
I: Interner,
impl<I> Eq for CanonicalVarKind<I>where
I: Interner,
Auto Trait Implementations§
impl<I> DynSend for CanonicalVarKind<I>where
<I as Interner>::PlaceholderTy: DynSend,
<I as Interner>::PlaceholderRegion: DynSend,
<I as Interner>::PlaceholderConst: DynSend,
impl<I> DynSync for CanonicalVarKind<I>where
<I as Interner>::PlaceholderTy: DynSync,
<I as Interner>::PlaceholderRegion: DynSync,
<I as Interner>::PlaceholderConst: DynSync,
impl<I> Freeze for CanonicalVarKind<I>where
<I as Interner>::PlaceholderTy: Freeze,
<I as Interner>::PlaceholderRegion: Freeze,
<I as Interner>::PlaceholderConst: Freeze,
impl<I> RefUnwindSafe for CanonicalVarKind<I>where
<I as Interner>::PlaceholderTy: RefUnwindSafe,
<I as Interner>::PlaceholderRegion: RefUnwindSafe,
<I as Interner>::PlaceholderConst: RefUnwindSafe,
impl<I> Send for CanonicalVarKind<I>where
<I as Interner>::PlaceholderTy: Send,
<I as Interner>::PlaceholderRegion: Send,
<I as Interner>::PlaceholderConst: Send,
impl<I> Sync for CanonicalVarKind<I>where
<I as Interner>::PlaceholderTy: Sync,
<I as Interner>::PlaceholderRegion: Sync,
<I as Interner>::PlaceholderConst: Sync,
impl<I> Unpin for CanonicalVarKind<I>where
<I as Interner>::PlaceholderTy: Unpin,
<I as Interner>::PlaceholderRegion: Unpin,
<I as Interner>::PlaceholderConst: Unpin,
impl<I> UnwindSafe for CanonicalVarKind<I>where
<I as Interner>::PlaceholderTy: UnwindSafe,
<I as Interner>::PlaceholderRegion: UnwindSafe,
<I as Interner>::PlaceholderConst: UnwindSafe,
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
Source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.Source§impl<T> Instrument for T
impl<T> Instrument for T
Source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
Source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
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 moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
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 moreSource§impl<T> Pointable for T
impl<T> Pointable for T
Source§impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
Source§impl<I, T> UpcastFrom<I, T> for T
impl<I, T> UpcastFrom<I, T> for T
fn upcast_from(from: T, _tcx: I) -> T
Source§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
Source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
Source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
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.