Struct rustc_infer::infer::sub::Sub

pub struct Sub<'combine, 'a, 'tcx> {
    fields: &'combine mut CombineFields<'a, 'tcx>,
    a_is_expected: bool,
}

Ensures a is made a subtype of b. Returns a on success.

Fields

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

a_is_expected: bool

Implementations

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

pub fn new( f: &'combine mut CombineFields<'infcx, 'tcx>, a_is_expected: bool ) -> Sub<'combine, 'infcx, 'tcx>

fn with_expected_switched<R, F: FnOnce(&mut Self) -> R>(&mut self, f: F) -> R

Trait Implementations

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

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 alias_relate_direction(&self) -> AliasRelationDirection

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

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

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

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

Returns a static string we can use for printouts.

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

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

fn a_is_expected(&self) -> bool

Returns true if the value a is the “expected” type in the relation. Just affects error messages.

fn with_cause<F, R>(&mut self, cause: Cause, f: F) -> Rwhere F: FnOnce(&mut Self) -> R,

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.

fn relate_item_args( &mut self, item_def_id: DefId, a_arg: &'tcx List<GenericArg<'tcx>>, b_arg: &'tcx List<GenericArg<'tcx>> ) -> Result<&'tcx List<GenericArg<'tcx>>, TypeError<'tcx>>

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

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