Struct rustc_middle::ty::Canonical
source · pub struct Canonical<I, V>where
I: Interner,{
pub value: V,
pub max_universe: UniverseIndex,
pub defining_opaque_types: <I as Interner>::DefiningOpaqueTypes,
pub variables: <I as Interner>::CanonicalVars,
}
Expand description
A “canonicalized” type V
is one where all free inference
variables have been rewritten to “canonical vars”. These are
numbered starting from 0 in order of first appearance.
Fields§
§value: V
§max_universe: UniverseIndex
§defining_opaque_types: <I as Interner>::DefiningOpaqueTypes
§variables: <I as Interner>::CanonicalVars
Implementations§
source§impl<I, V> Canonical<I, V>where
I: Interner,
impl<I, V> Canonical<I, V>where
I: Interner,
sourcepub fn unchecked_map<W>(self, map_op: impl FnOnce(V) -> W) -> Canonical<I, W>
pub fn unchecked_map<W>(self, map_op: impl FnOnce(V) -> W) -> Canonical<I, W>
Allows you to map the value
of a canonical while keeping the
same set of bound variables.
WARNING: This function is very easy to mis-use, hence the
name! In particular, the new value W
must use all the
same type/region variables in precisely the same order
as the original! (The ordering is defined by the
TypeFoldable
implementation of the type in question.)
An example of a correct use of this:
let a: Canonical<I, T> = ...;
let b: Canonical<I, (T,)> = a.unchecked_map(|v| (v, ));
An example of an incorrect use of this:
let a: Canonical<I, T> = ...;
let ty: Ty<I> = ...;
let b: Canonical<I, (T, Ty<I>)> = a.unchecked_map(|v| (v, ty));
sourcepub fn unchecked_rebind<W>(self, value: W) -> Canonical<I, W>
pub fn unchecked_rebind<W>(self, value: W) -> Canonical<I, W>
Allows you to map the value
of a canonical while keeping the same set of
bound variables.
WARNING: This function is very easy to mis-use, hence the name! See the comment of Canonical::unchecked_map for more details.
Trait Implementations§
source§impl<I, V, __D> Decodable<__D> for Canonical<I, V>where
I: Interner,
__D: TyDecoder<I = I>,
V: Decodable<__D>,
<I as Interner>::DefiningOpaqueTypes: Decodable<__D>,
<I as Interner>::CanonicalVars: Decodable<__D>,
impl<I, V, __D> Decodable<__D> for Canonical<I, V>where
I: Interner,
__D: TyDecoder<I = I>,
V: Decodable<__D>,
<I as Interner>::DefiningOpaqueTypes: Decodable<__D>,
<I as Interner>::CanonicalVars: Decodable<__D>,
source§impl<I, V, __E> Encodable<__E> for Canonical<I, V>where
I: Interner,
__E: TyEncoder<I = I>,
V: Encodable<__E>,
<I as Interner>::DefiningOpaqueTypes: Encodable<__E>,
<I as Interner>::CanonicalVars: Encodable<__E>,
impl<I, V, __E> Encodable<__E> for Canonical<I, V>where
I: Interner,
__E: TyEncoder<I = I>,
V: Encodable<__E>,
<I as Interner>::DefiningOpaqueTypes: Encodable<__E>,
<I as Interner>::CanonicalVars: Encodable<__E>,
source§impl<I, V, __CTX> HashStable<__CTX> for Canonical<I, V>where
I: Interner,
V: HashStable<__CTX>,
<I as Interner>::DefiningOpaqueTypes: HashStable<__CTX>,
<I as Interner>::CanonicalVars: HashStable<__CTX>,
impl<I, V, __CTX> HashStable<__CTX> for Canonical<I, V>where
I: Interner,
V: HashStable<__CTX>,
<I as Interner>::DefiningOpaqueTypes: HashStable<__CTX>,
<I as Interner>::CanonicalVars: HashStable<__CTX>,
fn hash_stable( &self, __hcx: &mut __CTX, __hasher: &mut StableHasher<SipHasher128>, )
source§impl<I, V> PartialEq for Canonical<I, V>
impl<I, V> PartialEq for Canonical<I, V>
source§impl<I, V> TypeFoldable<I> for Canonical<I, V>where
I: Interner,
V: TypeFoldable<I>,
<I as Interner>::DefiningOpaqueTypes: TypeFoldable<I>,
<I as Interner>::CanonicalVars: TypeFoldable<I>,
impl<I, V> TypeFoldable<I> for Canonical<I, V>where
I: Interner,
V: TypeFoldable<I>,
<I as Interner>::DefiningOpaqueTypes: TypeFoldable<I>,
<I as Interner>::CanonicalVars: TypeFoldable<I>,
source§fn try_fold_with<__F>(
self,
__folder: &mut __F,
) -> Result<Canonical<I, V>, <__F as FallibleTypeFolder<I>>::Error>where
__F: FallibleTypeFolder<I>,
fn try_fold_with<__F>(
self,
__folder: &mut __F,
) -> Result<Canonical<I, V>, <__F as FallibleTypeFolder<I>>::Error>where
__F: FallibleTypeFolder<I>,
source§fn fold_with<F>(self, folder: &mut F) -> Selfwhere
F: TypeFolder<I>,
fn fold_with<F>(self, folder: &mut F) -> Selfwhere
F: TypeFolder<I>,
try_fold_with
for use with infallible
folders. Do not override this method, to ensure coherence with
try_fold_with
.source§impl<I, V> TypeVisitable<I> for Canonical<I, V>where
I: Interner,
V: TypeVisitable<I>,
<I as Interner>::DefiningOpaqueTypes: TypeVisitable<I>,
<I as Interner>::CanonicalVars: TypeVisitable<I>,
impl<I, V> TypeVisitable<I> for Canonical<I, V>where
I: Interner,
V: TypeVisitable<I>,
<I as Interner>::DefiningOpaqueTypes: TypeVisitable<I>,
<I as Interner>::CanonicalVars: TypeVisitable<I>,
source§fn visit_with<__V>(
&self,
__visitor: &mut __V,
) -> <__V as TypeVisitor<I>>::Resultwhere
__V: TypeVisitor<I>,
fn visit_with<__V>(
&self,
__visitor: &mut __V,
) -> <__V as TypeVisitor<I>>::Resultwhere
__V: TypeVisitor<I>,
impl<I, V> Copy for Canonical<I, V>
impl<I, V> Eq for Canonical<I, V>
Auto Trait Implementations§
impl<I, V> Freeze for Canonical<I, V>where
V: Freeze,
<I as Interner>::DefiningOpaqueTypes: Freeze,
<I as Interner>::CanonicalVars: Freeze,
impl<I, V> RefUnwindSafe for Canonical<I, V>where
V: RefUnwindSafe,
<I as Interner>::DefiningOpaqueTypes: RefUnwindSafe,
<I as Interner>::CanonicalVars: RefUnwindSafe,
impl<I, V> Send for Canonical<I, V>
impl<I, V> Sync for Canonical<I, V>
impl<I, V> Unpin for Canonical<I, V>
impl<I, V> UnwindSafe for Canonical<I, V>where
V: UnwindSafe,
<I as Interner>::DefiningOpaqueTypes: UnwindSafe,
<I as Interner>::CanonicalVars: UnwindSafe,
Blanket Implementations§
source§impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T
fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'a mut [T]
source§impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T
fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'a mut [T]
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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: Copy,
impl<T> CloneToUninit for Twhere
T: Copy,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
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impl<Tcx, T> DepNodeParams<Tcx> for T
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default fn to_debug_str(&self, _: Tcx) -> String
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DepNode
,
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s during red-green
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is not FingerprintStyle::Opaque
.
It is always valid to return None
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impl<Q, K> Equivalent<K> for Q
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and return true
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self,
filter_name: &'static str,
) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
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or bound by some binder outside of binder
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fn references_error(&self) -> bool
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Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.