Struct rustc_trait_selection::solve::inspect::InspectCandidate

pub struct InspectCandidate<'a, 'tcx> {
    goal: &'a InspectGoal<'a, 'tcx>,
    kind: ProbeKind<'tcx>,
    nested_goals: Vec<(GoalSource, CanonicalState<'tcx, Goal<'tcx, Predicate<'tcx>>>)>,
    final_state: CanonicalState<'tcx, ()>,
    impl_args: Option<CanonicalState<'tcx, GenericArgsRef<'tcx>>>,
    result: QueryResult<'tcx>,
    shallow_certainty: Certainty,
}

Fields

goal: &'a InspectGoal<'a, 'tcx>

kind: ProbeKind<'tcx>

nested_goals: Vec<(GoalSource, CanonicalState<'tcx, Goal<'tcx, Predicate<'tcx>>>)>

final_state: CanonicalState<'tcx, ()>

impl_args: Option<CanonicalState<'tcx, GenericArgsRef<'tcx>>>

result: QueryResult<'tcx>

shallow_certainty: Certainty

Implementations

impl<'a, 'tcx> InspectCandidate<'a, 'tcx>

pub fn kind(&self) -> ProbeKind<'tcx>

pub fn result(&self) -> Result<Certainty, NoSolution>

pub fn goal(&self) -> &'a InspectGoal<'a, 'tcx>

pub fn shallow_certainty(&self) -> Certainty

Certainty passed into evaluate_added_goals_and_make_canonical_response.

If this certainty is Yes, then we must be confident that the candidate must hold iff it’s nested goals hold. This is not true if the certainty is Maybe(..), which suggests we forced ambiguity instead.

This is not the certainty of the candidate’s full nested evaluation, which can be accessed with Self::result instead.

pub fn visit_nested_no_probe<V: ProofTreeVisitor<'tcx>>( &self, visitor: &mut V ) -> V::Result

Visit all nested goals of this candidate without rolling back their inference constraints. This function modifies the state of the infcx.

pub fn instantiate_nested_goals(&self, span: Span) -> Vec<InspectGoal<'a, 'tcx>>

Instantiate the nested goals for the candidate without rolling back their inference constraints. This function modifies the state of the infcx.

See Self::instantiate_nested_goals_and_opt_impl_args if you need the impl args too.

pub fn instantiate_nested_goals_and_opt_impl_args( &self, span: Span ) -> (Vec<InspectGoal<'a, 'tcx>>, Option<GenericArgsRef<'tcx>>)

Instantiate the nested goals for the candidate without rolling back their inference constraints, and optionally the args of an impl if this candidate came from a CandidateSource::Impl. This function modifies the state of the infcx.

pub fn visit_nested_in_probe<V: ProofTreeVisitor<'tcx>>( &self, visitor: &mut V ) -> V::Result

Visit all nested goals of this candidate, rolling back all inference constraints.

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: 224 bytes