Struct rustc_trait_selection::solve::inspect::InspectCandidate

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

Fields

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

kind: ProbeKind<'tcx>

nested_goals: Vec<CanonicalState<'tcx, Goal<'tcx, Predicate<'tcx>>>>

final_state: CanonicalState<'tcx, ()>

result: QueryResult<'tcx>

candidate_certainty: Option<Certainty>

Implementations

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

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

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

pub fn candidate_certainty(&self) -> Option<Certainty>

Certainty passed into evaluate_added_goals_and_make_canonical_response.

If this certainty is Some(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 Some(Maybe), which suggests we forced ambiguity instead, or if it is None, which suggests we may have not assembled any candidates at all.

This is not the certainty of the candidate’s 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 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: 192 bytes