pub trait ObligationEmittingRelation<'tcx>: TypeRelation<'tcx> {
    // Required methods
    fn span(&self) -> Span;
    fn param_env(&self) -> ParamEnv<'tcx>;
    fn structurally_relate_aliases(&self) -> StructurallyRelateAliases;
    fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>);
    fn register_predicates(
        &mut self,
        obligations: impl IntoIterator<Item: ToPredicate<'tcx>>
    );
    fn alias_relate_direction(&self) -> AliasRelationDirection;

    // Provided method
    fn register_type_relate_obligation(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) { ... }
}

Required Methods§

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fn span(&self) -> Span

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fn param_env(&self) -> ParamEnv<'tcx>

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fn structurally_relate_aliases(&self) -> StructurallyRelateAliases

Whether aliases should be related structurally. This is pretty much always No unless you’re equating in some specific locations of the new solver. See the comments in these use-cases for more details.

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fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>)

Register obligations that must hold in order for this relation to hold

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fn register_predicates( &mut self, obligations: impl IntoIterator<Item: ToPredicate<'tcx>> )

Register predicates that must hold in order for this relation to hold. Uses a default obligation cause, ObligationEmittingRelation::register_obligations should be used if control over the obligation causes is required.

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fn alias_relate_direction(&self) -> AliasRelationDirection

Relation direction emitted for AliasRelate predicates, corresponding to the direction of the relation.

Provided Methods§

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fn register_type_relate_obligation(&mut self, a: Ty<'tcx>, b: Ty<'tcx>)

Register an obligation that both types must be related to each other according to the ty::AliasRelationDirection given by ObligationEmittingRelation::alias_relate_direction

Object Safety§

This trait is not object safe.

Implementors§

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impl<'tcx> ObligationEmittingRelation<'tcx> for Equate<'_, '_, 'tcx>

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impl<'tcx> ObligationEmittingRelation<'tcx> for Glb<'_, '_, 'tcx>

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impl<'tcx> ObligationEmittingRelation<'tcx> for Lub<'_, '_, 'tcx>

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impl<'tcx> ObligationEmittingRelation<'tcx> for Sub<'_, '_, 'tcx>