Struct WfCheckingCtxt 

pub(super) struct WfCheckingCtxt<'a, 'tcx> {
    pub(super) ocx: ObligationCtxt<'a, 'tcx, FulfillmentError<'tcx>>,
    body_def_id: LocalDefId,
    param_env: ParamEnv<'tcx>,
}

Fields

ocx: ObligationCtxt<'a, 'tcx, FulfillmentError<'tcx>>

body_def_id: LocalDefId

param_env: ParamEnv<'tcx>

Implementations

impl<'tcx> WfCheckingCtxt<'_, 'tcx>

fn tcx(&self) -> TyCtxt<'tcx>

fn normalize<T>(&self, span: Span, loc: Option<WellFormedLoc>, value: T) -> T

where T: TypeFoldable<TyCtxt<'tcx>>,

pub(super) fn deeply_normalize<T>( &self, span: Span, loc: Option<WellFormedLoc>, value: T, ) -> T

where T: TypeFoldable<TyCtxt<'tcx>>,

Convenience function to deeply normalize during wfcheck. In the old solver, this just dispatches to WfCheckingCtxt::normalize, but in the new solver this calls deeply_normalize and reports errors if they are encountered.

This function should be called in favor of normalize in cases where we will then check the well-formedness of the type, since we only use the normalized signature types for implied bounds when checking regions.

pub(super) fn register_wf_obligation( &self, span: Span, loc: Option<WellFormedLoc>, term: Term<'tcx>, )

impl<'tcx> WfCheckingCtxt<'_, 'tcx>

fn check_false_global_bounds(&mut self)

Feature gates RFC 2056 – trivial bounds, checking for global bounds that aren’t true.

Methods from Deref<Target = ObligationCtxt<'a, 'tcx, FulfillmentError<'tcx>>>

pub fn register_obligation(&self, obligation: Obligation<'tcx, Predicate<'tcx>>)

pub fn register_obligations( &self, obligations: impl IntoIterator<Item = Obligation<'tcx, Predicate<'tcx>>>, )

pub fn register_infer_ok_obligations<T>(&self, infer_ok: InferOk<'tcx, T>) -> T

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>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, value: T, ) -> T

where T: TypeFoldable<TyCtxt<'tcx>>,

pub fn eq<T>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, expected: T, actual: T, ) -> Result<(), TypeError<TyCtxt<'tcx>>>

where T: ToTrace<'tcx>,

pub fn eq_trace<T>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, trace: TypeTrace<'tcx>, expected: T, actual: T, ) -> Result<(), TypeError<TyCtxt<'tcx>>>

where T: Relate<TyCtxt<'tcx>>,

pub fn sub<T>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, expected: T, actual: T, ) -> Result<(), TypeError<TyCtxt<'tcx>>>

where T: ToTrace<'tcx>,

Checks whether expected is a subtype of actual: expected <: actual.

pub fn relate<T>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, variance: Variance, expected: T, actual: T, ) -> Result<(), TypeError<TyCtxt<'tcx>>>

where T: ToTrace<'tcx>,

pub fn sup<T>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, expected: T, actual: T, ) -> Result<(), TypeError<TyCtxt<'tcx>>>

where T: ToTrace<'tcx>,

Checks whether expected is a supertype of actual: expected :> actual.

pub fn lub<T>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, expected: T, actual: T, ) -> Result<T, TypeError<TyCtxt<'tcx>>>

where T: ToTrace<'tcx>,

Computes the least-upper-bound, or mutual supertype, of two values.

pub fn try_evaluate_obligations(&self) -> Vec<E>

Go over the list of pending obligations and try to evaluate them.

For each result: Ok: remove the obligation from the list Ambiguous: leave the obligation in the list to be evaluated later Err: remove the obligation from the list and return an error

Returns a list of errors from obligations that evaluated to Err.

pub fn evaluate_obligations_error_on_ambiguity(&self) -> Vec<E>

Evaluate all pending obligations, return error if they can’t be evaluated.

For each result: Ok: remove the obligation from the list Ambiguous: remove the obligation from the list and return an error Err: remove the obligation from the list and return an error

Returns a list of errors from obligations that evaluated to Ambiguous or Err.

pub fn assumed_wf_types_and_report_errors( &self, param_env: ParamEnv<'tcx>, def_id: LocalDefId, ) -> Result<IndexSet<Ty<'tcx>, BuildHasherDefault<FxHasher>>, ErrorGuaranteed>

pub fn make_canonicalized_query_response<T>( &self, inference_vars: CanonicalVarValues<TyCtxt<'tcx>>, answer: T, ) -> Result<&'tcx Canonical<TyCtxt<'tcx>, QueryResponse<'tcx, T>>, NoSolution>

where T: Debug + TypeFoldable<TyCtxt<'tcx>>, Canonical<TyCtxt<'tcx>, QueryResponse<'tcx, T>>: ArenaAllocatable<'tcx>,

pub fn assumed_wf_types( &self, param_env: ParamEnv<'tcx>, def_id: LocalDefId, ) -> Result<IndexSet<Ty<'tcx>, BuildHasherDefault<FxHasher>>, Vec<E>>

pub fn deeply_normalize<T>( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, value: T, ) -> Result<T, Vec<E>>

where T: TypeFoldable<TyCtxt<'tcx>>,

pub fn structurally_normalize_ty( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, value: Ty<'tcx>, ) -> Result<Ty<'tcx>, Vec<E>>

pub fn structurally_normalize_const( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, value: Const<'tcx>, ) -> Result<Const<'tcx>, Vec<E>>

pub fn structurally_normalize_term( &self, cause: &ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, value: Term<'tcx>, ) -> Result<Term<'tcx>, Vec<E>>

Trait Implementations

impl<'a, 'tcx> Deref for WfCheckingCtxt<'a, 'tcx>

type Target = ObligationCtxt<'a, 'tcx, FulfillmentError<'tcx>>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

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: 48 bytes