Struct rustc_trait_selection::traits::fulfill::FulfillProcessor

pub(in traits::fulfill) struct FulfillProcessor<'a, 'b, 'tcx> {
    selcx: &'a mut SelectionContext<'b, 'tcx>,
    register_region_obligations: bool,
}

Fields

selcx: &'a mut SelectionContext<'b, 'tcx>

register_region_obligations: bool

Implementations

impl<'a, 'b, 'tcx> FulfillProcessor<'a, 'b, 'tcx>

pub(in traits::fulfill) fn progress_changed_obligations(
    &mut self,
    pending_obligation: &mut PendingPredicateObligation<'tcx>
) -> ProcessResult<PendingPredicateObligation<'tcx>, FulfillmentErrorCode<'tcx>>

pub(in traits::fulfill) fn process_trait_obligation(
    &mut self,
    obligation: &PredicateObligation<'tcx>,
    trait_obligation: TraitObligation<'tcx>,
    stalled_on: &mut Vec<TyOrConstInferVar<'tcx>>
) -> ProcessResult<PendingPredicateObligation<'tcx>, FulfillmentErrorCode<'tcx>>

pub(in traits::fulfill) fn process_projection_obligation(
    &mut self,
    project_obligation: Obligation<'tcx, PolyProjectionPredicate<'tcx>>,
    stalled_on: &mut Vec<TyOrConstInferVar<'tcx>>
) -> ProcessResult<PendingPredicateObligation<'tcx>, FulfillmentErrorCode<'tcx>>

Trait Implementations

impl<'a, 'b, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'b, 'tcx>

type Obligation = PendingPredicateObligation<'tcx>

type Error = FulfillmentErrorCode<'tcx>

pub fn process_obligation(
    &mut self,
    pending_obligation: &mut Self::Obligation
) -> ProcessResult<Self::Obligation, Self::Error>

Processes a predicate obligation and returns either:

• Changed(v) if the predicate is true, presuming that v are also true
• Unchanged if we don't have enough info to be sure
• Error(e) if the predicate does not hold

This is always inlined, despite its size, because it has a single callsite and it is called very frequently.

pub fn process_backedge<'c, I>(
    &mut self,
    cycle: I,
    _marker: PhantomData<&'c PendingPredicateObligation<'tcx>>
) where
    I: Clone + Iterator<Item = &'c PendingPredicateObligation<'tcx>>, 

As we do the cycle check, we invoke this callback when we encounter an actual cycle. cycle is an iterator that starts at the start of the cycle in the stack and walks toward the top.