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> ConstEquateRelation<'tcx> for Sub<'_, '_, '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 Sub<'_, '_, 'tcx>

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

Returns a static string we can use for printouts.

fn intercrate(&self) -> bool

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 mark_ambiguous(&mut self)

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

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_substs(
    &mut self,
    item_def_id: DefId,
    a_subst: &'tcx List<GenericArg<'tcx>>,
    b_subst: &'tcx List<GenericArg<'tcx>>
) -> Result<&'tcx List<GenericArg<'tcx>>, TypeError<'tcx>>

Relate the two substitutions 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