pub struct Sub<'combine, 'infcx, 'tcx> {
fields: &'combine mut CombineFields<'infcx, 'tcx>,
a_is_expected: bool,
}Expand description
Ensures a is made a subtype of b. Returns a on success.
Fields
fields: &'combine mut CombineFields<'infcx, 'tcx>a_is_expected: boolImplementations
sourceimpl<'combine, 'infcx, 'tcx> Sub<'combine, 'infcx, 'tcx>
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
sourceimpl<'tcx> ConstEquateRelation<'tcx> for Sub<'_, '_, 'tcx>
impl<'tcx> ConstEquateRelation<'tcx> for Sub<'_, '_, 'tcx>
sourcefn const_equate_obligation(
&mut self,
a: &'tcx Const<'tcx>,
b: &'tcx Const<'tcx>
)
fn const_equate_obligation(
&mut self,
a: &'tcx Const<'tcx>,
b: &'tcx Const<'tcx>
)
Register an obligation that both constants must be equal to each other. Read more
sourceimpl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx>
impl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx>
fn tcx(&self) -> TyCtxt<'tcx>
fn param_env(&self) -> ParamEnv<'tcx>
sourcefn a_is_expected(&self) -> bool
fn a_is_expected(&self) -> bool
Returns true if the value a is the “expected” type in the
relation. Just affects error messages. Read more
fn with_cause<F, R>(&mut self, cause: Cause, f: F) -> R where
F: FnOnce(&mut Self) -> R,
sourcefn relate_with_variance<T: Relate<'tcx>>(
&mut self,
variance: Variance,
_info: VarianceDiagInfo<'tcx>,
a: T,
b: T
) -> RelateResult<'tcx, T>
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: &'tcx Const<'tcx>,
b: &'tcx Const<'tcx>
) -> RelateResult<'tcx, &'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>,
sourcefn relate<T>(&mut self, a: T, b: T) -> Result<T, TypeError<'tcx>> 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.
sourcefn 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>>
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. Read more
Auto Trait Implementations
impl<'combine, 'infcx, 'tcx> !RefUnwindSafe for Sub<'combine, 'infcx, 'tcx>
impl<'combine, 'infcx, 'tcx> !Send for Sub<'combine, 'infcx, 'tcx>
impl<'combine, 'infcx, 'tcx> !Sync for Sub<'combine, 'infcx, 'tcx>
impl<'combine, 'infcx, 'tcx> Unpin for Sub<'combine, 'infcx, 'tcx> where
'infcx: 'combine,
'tcx: 'combine,
impl<'combine, 'infcx, 'tcx> !UnwindSafe for Sub<'combine, 'infcx, 'tcx>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcepub fn borrow_mut(&mut self) -> &mut T
pub fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<'a, T> Captures<'a> for T where
T: ?Sized,
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