pub(super) enum ProjectAndUnifyResult<'tcx> {
Holds(Vec<PredicateObligation<'tcx>>),
FailedNormalization,
Recursive,
MismatchedProjectionTypes(MismatchedProjectionTypes<'tcx>),
}
Expand description
States returned from poly_project_and_unify_type
. Takes the place
of the old return type, which was:
Result<
Result<Option<Vec<PredicateObligation<'tcx>>>, InProgress>,
MismatchedProjectionTypes<'tcx>,
>
Variants§
Holds(Vec<PredicateObligation<'tcx>>)
The projection bound holds subject to the given obligations. If the
projection cannot be normalized because the required trait bound does
not hold, this is returned, with obligations
being a predicate that
cannot be proven.
FailedNormalization
The projection cannot be normalized due to ambiguity. Resolving some inference variables in the projection may fix this.
Recursive
The project cannot be normalized because poly_project_and_unify_type
is called recursively while normalizing the same projection.
MismatchedProjectionTypes(MismatchedProjectionTypes<'tcx>)
Auto Trait Implementations§
impl<'tcx> Freeze for ProjectAndUnifyResult<'tcx>
impl<'tcx> !RefUnwindSafe for ProjectAndUnifyResult<'tcx>
impl<'tcx> !Send for ProjectAndUnifyResult<'tcx>
impl<'tcx> !Sync for ProjectAndUnifyResult<'tcx>
impl<'tcx> Unpin for ProjectAndUnifyResult<'tcx>
impl<'tcx> !UnwindSafe for ProjectAndUnifyResult<'tcx>
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, 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: 32 bytes
Size for each variant:
Holds
: 32 bytesFailedNormalization
: 0 bytesRecursive
: 0 bytesMismatchedProjectionTypes
: 32 bytes