Struct rustc_infer::infer::equate::Equate

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

Ensures a is made equal to b. Returns a on success.

Fields

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

a_is_expected: bool

Implementations

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

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

Trait Implementations

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

fn const_equate_obligation(&mut self, a: Const<'tcx>, b: Const<'tcx>)

Register an obligation that both constants must be equal to each other.

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

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

Returns a static string we can use for printouts.

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

fn intercrate(&self) -> bool

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 mark_ambiguous(&mut self)

Used during coherence. If called, must emit an always-ambiguous obligation.

fn relate_item_substs(
    &mut self,
    _item_def_id: DefId,
    a_subst: SubstsRef<'tcx>,
    b_subst: SubstsRef<'tcx>
) -> RelateResult<'tcx, SubstsRef<'tcx>>

Relate the two substitutions 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,
    _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 with_cause<F, R>(&mut self, _cause: Cause, f: F) -> Rwhere
    F: FnOnce(&mut Self) -> R,

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