Struct rustc_infer::infer::relate::type_relating::TypeRelating

pub struct TypeRelating<'combine, 'a, 'tcx> {
    fields: &'combine mut CombineFields<'a, 'tcx>,
    structurally_relate_aliases: StructurallyRelateAliases,
    ambient_variance: Variance,
}

Enforce that a is equal to or a subtype of b.

Fields

fields: &'combine mut CombineFields<'a, 'tcx>

structurally_relate_aliases: StructurallyRelateAliases

ambient_variance: Variance

Implementations

impl<'combine, 'infcx, 'tcx> TypeRelating<'combine, 'infcx, 'tcx>

pub fn new( f: &'combine mut CombineFields<'infcx, 'tcx>, structurally_relate_aliases: StructurallyRelateAliases, ambient_variance: Variance ) -> TypeRelating<'combine, 'infcx, 'tcx>

Trait Implementations

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

fn span(&self) -> Span

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

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.

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.

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

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

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

Register AliasRelate obligation(s) that both types must be related to each other.

impl<'tcx> TypeRelation<'tcx> for TypeRelating<'_, '_, 'tcx>

fn tag(&self) -> &'static str

Returns a static string we can use for printouts.

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

fn relate_item_args( &mut self, item_def_id: DefId, a_arg: GenericArgsRef<'tcx>, b_arg: GenericArgsRef<'tcx> ) -> RelateResult<'tcx, GenericArgsRef<'tcx>>

Relate the two args for the given item. The default is to look up the variance for the item and proceed accordingly.

fn relate_with_variance<T: Relate<'tcx>>( &mut self, variance: Variance, _info: VarianceDiagInfo<'tcx>, a: T, b: T ) -> RelateResult<'tcx, T>

Switch variance for the purpose of relating a and b.

fn tys(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>>

fn regions( &mut self, a: Region<'tcx>, b: Region<'tcx> ) -> RelateResult<'tcx, Region<'tcx>>

fn consts( &mut self, a: Const<'tcx>, b: Const<'tcx> ) -> RelateResult<'tcx, Const<'tcx>>

fn binders<T>( &mut self, a: Binder<'tcx, T>, b: Binder<'tcx, T> ) -> RelateResult<'tcx, Binder<'tcx, T>>

where T: Relate<'tcx>,

fn relate<T>(&mut self, a: T, b: T) -> Result<T, TypeError<'tcx>>

where T: Relate<'tcx>,

Generic relation routine suitable for most anything.

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: 16 bytes