Struct rustc_trait_selection::infer::at::At
source · pub struct At<'a, 'tcx> {
pub infcx: &'a InferCtxt<'tcx>,
pub cause: &'a ObligationCause<'tcx>,
pub param_env: ParamEnv<'tcx>,
}
Fields§
§infcx: &'a InferCtxt<'tcx>
§cause: &'a ObligationCause<'tcx>
§param_env: ParamEnv<'tcx>
Implementations§
source§impl<'a, 'tcx> At<'a, 'tcx>
impl<'a, 'tcx> At<'a, 'tcx>
sourcepub fn sup<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
pub fn sup<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
Makes actual <: expected
. For example, if type-checking a
call like foo(x)
, where foo: fn(i32)
, you might have
sup(i32, x)
, since the “expected” type is the type that
appears in the signature.
sourcepub fn sub<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
pub fn sub<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
Makes expected <: actual
.
sourcepub fn eq<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
pub fn eq<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
Makes expected == actual
.
sourcepub fn eq_structurally_relating_aliases<T>(
self,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
pub fn eq_structurally_relating_aliases<T>(
self,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
Equates expected
and found
while structurally relating aliases.
This should only be used inside of the next generation trait solver
when relating rigid aliases.
pub fn relate<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
variance: Variance,
actual: T,
) -> Result<InferOk<'tcx, ()>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
sourcepub fn relate_no_trace<T>(
self,
expected: T,
variance: Variance,
actual: T,
) -> Result<Vec<Goal<TyCtxt<'tcx>, Predicate<'tcx>>>, NoSolution>
pub fn relate_no_trace<T>( self, expected: T, variance: Variance, actual: T, ) -> Result<Vec<Goal<TyCtxt<'tcx>, Predicate<'tcx>>>, NoSolution>
Used in the new solver since we don’t care about tracking an ObligationCause
.
sourcepub fn eq_structurally_relating_aliases_no_trace<T>(
self,
expected: T,
actual: T,
) -> Result<Vec<Goal<TyCtxt<'tcx>, Predicate<'tcx>>>, NoSolution>
pub fn eq_structurally_relating_aliases_no_trace<T>( self, expected: T, actual: T, ) -> Result<Vec<Goal<TyCtxt<'tcx>, Predicate<'tcx>>>, NoSolution>
Used in the new solver since we don’t care about tracking an ObligationCause
.
sourcepub fn lub<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, T>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
pub fn lub<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T,
) -> Result<InferOk<'tcx, T>, TypeError<TyCtxt<'tcx>>>where
T: ToTrace<'tcx>,
Computes the least-upper-bound, or mutual supertype, of two values. The order of the arguments doesn’t matter, but since this can result in an error (e.g., if asked to compute LUB of u32 and i32), it is meaningful to call one of them the “expected type”.
Trait Implementations§
source§impl<'tcx> NormalizeExt<'tcx> for At<'_, 'tcx>
impl<'tcx> NormalizeExt<'tcx> for At<'_, 'tcx>
source§fn normalize<T: TypeFoldable<TyCtxt<'tcx>>>(&self, value: T) -> InferOk<'tcx, T>
fn normalize<T: TypeFoldable<TyCtxt<'tcx>>>(&self, value: T) -> InferOk<'tcx, T>
Normalize a value using the AssocTypeNormalizer
.
This normalization should be used when the type contains inference variables or the projection may be fallible.
source§fn deeply_normalize<T, E>(
self,
value: T,
fulfill_cx: &mut dyn TraitEngine<'tcx, E>,
) -> Result<T, Vec<E>>
fn deeply_normalize<T, E>( self, value: T, fulfill_cx: &mut dyn TraitEngine<'tcx, E>, ) -> Result<T, Vec<E>>
Deeply normalizes value
, replacing all aliases which can by normalized in
the current environment. In the new solver this errors in case normalization
fails or is ambiguous.
In the old solver this simply uses normalizes
and adds the nested obligations
to the fulfill_cx
. This is necessary as we otherwise end up recomputing the
same goals in both a temporary and the shared context which negatively impacts
performance as these don’t share caching.
FIXME(-Znext-solver): For performance reasons, we currently reuse an existing
fulfillment context in the old solver. Once we have removed the old solver, we
can remove the fulfill_cx
parameter on this function.
source§impl<'cx, 'tcx> QueryNormalizeExt<'tcx> for At<'cx, 'tcx>
impl<'cx, 'tcx> QueryNormalizeExt<'tcx> for At<'cx, 'tcx>
source§fn query_normalize<T>(self, value: T) -> Result<Normalized<'tcx, T>, NoSolution>where
T: TypeFoldable<TyCtxt<'tcx>>,
fn query_normalize<T>(self, value: T) -> Result<Normalized<'tcx, T>, NoSolution>where
T: TypeFoldable<TyCtxt<'tcx>>,
Normalize value
in the context of the inference context,
yielding a resulting type, or an error if value
cannot be
normalized. If you don’t care about regions, you should prefer
normalize_erasing_regions
, which is more efficient.
If the normalization succeeds and is unambiguous, returns back the normalized value along with various outlives relations (in the form of obligations that must be discharged).
N.B., this will eventually be the main means of normalizing, but for now should be used only when we actually know that normalization will succeed, since error reporting and other details are still “under development”.
This normalization should only be used when the projection does not have possible ambiguity or may not be well-formed.
After codegen, when lifetimes do not matter, it is preferable to instead
use TyCtxt::normalize_erasing_regions
, which wraps this procedure.
source§impl<'tcx> StructurallyNormalizeExt<'tcx> for At<'_, 'tcx>
impl<'tcx> StructurallyNormalizeExt<'tcx> for At<'_, 'tcx>
fn structurally_normalize<E: 'tcx>( &self, ty: Ty<'tcx>, fulfill_cx: &mut dyn TraitEngine<'tcx, E>, ) -> Result<Ty<'tcx>, Vec<E>>
impl<'a, 'tcx> Copy for At<'a, 'tcx>
Auto Trait Implementations§
impl<'a, 'tcx> Freeze for At<'a, 'tcx>
impl<'a, 'tcx> !RefUnwindSafe for At<'a, 'tcx>
impl<'a, 'tcx> !Send for At<'a, 'tcx>
impl<'a, 'tcx> !Sync for At<'a, 'tcx>
impl<'a, 'tcx> Unpin for At<'a, 'tcx>
impl<'a, 'tcx> !UnwindSafe for At<'a, 'tcx>
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]
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§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<T> Filterable for T
impl<T> Filterable for T
source§fn filterable(
self,
filter_name: &'static str,
) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
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<P> IntoQueryParam<P> for P
impl<P> IntoQueryParam<P> for P
fn into_query_param(self) -> P
source§impl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> 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<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> 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>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
impl<T> ErasedDestructor for Twhere
T: 'static,
impl<T> MaybeSendSync for T
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