Struct rustc_trait_selection::traits::engine::ObligationCtxt
source · pub struct ObligationCtxt<'a, 'tcx, E = ScrubbedTraitError<'tcx>> {
pub infcx: &'a InferCtxt<'tcx>,
engine: RefCell<Box<dyn TraitEngine<'tcx, E>>>,
}
Expand description
Used if you want to have pleasant experience when dealing with obligations outside of hir or mir typeck.
Fields§
§infcx: &'a InferCtxt<'tcx>
§engine: RefCell<Box<dyn TraitEngine<'tcx, E>>>
Implementations§
source§impl<'a, 'tcx> ObligationCtxt<'a, 'tcx, FulfillmentError<'tcx>>
impl<'a, 'tcx> ObligationCtxt<'a, 'tcx, FulfillmentError<'tcx>>
pub fn new_with_diagnostics(infcx: &'a InferCtxt<'tcx>) -> Self
source§impl<'a, 'tcx> ObligationCtxt<'a, 'tcx, ScrubbedTraitError<'tcx>>
impl<'a, 'tcx> ObligationCtxt<'a, 'tcx, ScrubbedTraitError<'tcx>>
source§impl<'a, 'tcx, E> ObligationCtxt<'a, 'tcx, E>where
E: 'tcx,
impl<'a, 'tcx, E> ObligationCtxt<'a, 'tcx, E>where
E: 'tcx,
pub fn register_obligation(&self, obligation: PredicateObligation<'tcx>)
pub fn register_obligations( &self, obligations: impl IntoIterator<Item = PredicateObligation<'tcx>>, )
pub fn register_infer_ok_obligations<T>(&self, infer_ok: InferOk<'tcx, T>) -> T
sourcepub fn register_bound(
&self,
cause: ObligationCause<'tcx>,
param_env: ParamEnv<'tcx>,
ty: Ty<'tcx>,
def_id: DefId,
)
pub fn register_bound( &self, cause: ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, ty: Ty<'tcx>, def_id: DefId, )
Requires that ty
must implement the trait with def_id
in
the given environment. This trait must not have any type
parameters (except for Self
).
pub fn normalize<T: TypeFoldable<TyCtxt<'tcx>>>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, value: T, ) -> T
pub fn eq<T: ToTrace<'tcx>>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, expected: T, actual: T, ) -> Result<(), TypeError<'tcx>>
sourcepub fn sub<T: ToTrace<'tcx>>(
&self,
cause: &ObligationCause<'tcx>,
param_env: ParamEnv<'tcx>,
expected: T,
actual: T,
) -> Result<(), TypeError<'tcx>>
pub fn sub<T: ToTrace<'tcx>>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, expected: T, actual: T, ) -> Result<(), TypeError<'tcx>>
Checks whether expected
is a subtype of actual
: expected <: actual
.
pub fn relate<T: ToTrace<'tcx>>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, variance: Variance, expected: T, actual: T, ) -> Result<(), TypeError<'tcx>>
sourcepub fn sup<T: ToTrace<'tcx>>(
&self,
cause: &ObligationCause<'tcx>,
param_env: ParamEnv<'tcx>,
expected: T,
actual: T,
) -> Result<(), TypeError<'tcx>>
pub fn sup<T: ToTrace<'tcx>>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, expected: T, actual: T, ) -> Result<(), TypeError<'tcx>>
Checks whether expected
is a supertype of actual
: expected :> actual
.
pub fn select_where_possible(&self) -> Vec<E>
pub fn select_all_or_error(&self) -> Vec<E>
sourcepub fn into_pending_obligations(self) -> Vec<PredicateObligation<'tcx>>
pub fn into_pending_obligations(self) -> Vec<PredicateObligation<'tcx>>
Returns the not-yet-processed and stalled obligations from the
ObligationCtxt
.
Takes ownership of the context as doing operations such as
ObligationCtxt::eq
afterwards will result in other obligations
getting ignored. You can make a new ObligationCtxt
if this
needs to be done in a loop, for example.
sourcepub fn resolve_regions_and_report_errors(
self,
generic_param_scope: LocalDefId,
outlives_env: &OutlivesEnvironment<'tcx>,
) -> Result<(), ErrorGuaranteed>
pub fn resolve_regions_and_report_errors( self, generic_param_scope: LocalDefId, outlives_env: &OutlivesEnvironment<'tcx>, ) -> Result<(), ErrorGuaranteed>
Resolves regions and reports errors.
Takes ownership of the context as doing trait solving afterwards will result in region constraints getting ignored.
sourcepub fn resolve_regions(
self,
outlives_env: &OutlivesEnvironment<'tcx>,
) -> Vec<RegionResolutionError<'tcx>>
pub fn resolve_regions( self, outlives_env: &OutlivesEnvironment<'tcx>, ) -> Vec<RegionResolutionError<'tcx>>
Resolves regions and reports errors.
Takes ownership of the context as doing trait solving afterwards will result in region constraints getting ignored.
source§impl<'tcx> ObligationCtxt<'_, 'tcx, FulfillmentError<'tcx>>
impl<'tcx> ObligationCtxt<'_, 'tcx, FulfillmentError<'tcx>>
pub fn assumed_wf_types_and_report_errors( &self, param_env: ParamEnv<'tcx>, def_id: LocalDefId, ) -> Result<FxIndexSet<Ty<'tcx>>, ErrorGuaranteed>
source§impl<'tcx> ObligationCtxt<'_, 'tcx, ScrubbedTraitError<'tcx>>
impl<'tcx> ObligationCtxt<'_, 'tcx, ScrubbedTraitError<'tcx>>
pub fn make_canonicalized_query_response<T>(
&self,
inference_vars: CanonicalVarValues<'tcx>,
answer: T,
) -> Result<CanonicalQueryResponse<'tcx, T>, NoSolution>where
T: Debug + TypeFoldable<TyCtxt<'tcx>>,
Canonical<'tcx, QueryResponse<'tcx, T>>: ArenaAllocatable<'tcx>,
source§impl<'tcx, E> ObligationCtxt<'_, 'tcx, E>where
E: FromSolverError<'tcx, NextSolverError<'tcx>>,
impl<'tcx, E> ObligationCtxt<'_, 'tcx, E>where
E: FromSolverError<'tcx, NextSolverError<'tcx>>,
pub fn assumed_wf_types( &self, param_env: ParamEnv<'tcx>, def_id: LocalDefId, ) -> Result<FxIndexSet<Ty<'tcx>>, Vec<E>>
pub fn deeply_normalize<T: TypeFoldable<TyCtxt<'tcx>>>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, value: T, ) -> Result<T, Vec<E>>
pub fn structurally_normalize( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, value: Ty<'tcx>, ) -> Result<Ty<'tcx>, Vec<E>>
Auto Trait Implementations§
impl<'a, 'tcx, E = ScrubbedTraitError<'tcx>> !Freeze for ObligationCtxt<'a, 'tcx, E>
impl<'a, 'tcx, E = ScrubbedTraitError<'tcx>> !RefUnwindSafe for ObligationCtxt<'a, 'tcx, E>
impl<'a, 'tcx, E = ScrubbedTraitError<'tcx>> !Send for ObligationCtxt<'a, 'tcx, E>
impl<'a, 'tcx, E = ScrubbedTraitError<'tcx>> !Sync for ObligationCtxt<'a, 'tcx, E>
impl<'a, 'tcx, E> Unpin for ObligationCtxt<'a, 'tcx, E>
impl<'a, 'tcx, E = ScrubbedTraitError<'tcx>> !UnwindSafe for ObligationCtxt<'a, 'tcx, E>
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