pub enum PredicatePolarity {
Positive,
Negative,
}
Expand description
Polarity for a trait predicate. May either be negative or positive.
Distinguished from ImplPolarity
since we never compute goals with
“reservation” level.
Variants§
Implementations§
source§impl PredicatePolarity
impl PredicatePolarity
sourcepub fn flip(&self) -> PredicatePolarity
pub fn flip(&self) -> PredicatePolarity
Flips polarity by turning Positive
into Negative
and Negative
into Positive
.
Trait Implementations§
source§impl Clone for PredicatePolarity
impl Clone for PredicatePolarity
source§fn clone(&self) -> PredicatePolarity
fn clone(&self) -> PredicatePolarity
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for PredicatePolarity
impl Debug for PredicatePolarity
source§impl<__D: TyDecoder> Decodable<__D> for PredicatePolarity
impl<__D: TyDecoder> Decodable<__D> for PredicatePolarity
source§impl Display for PredicatePolarity
impl Display for PredicatePolarity
source§impl<__E: TyEncoder> Encodable<__E> for PredicatePolarity
impl<__E: TyEncoder> Encodable<__E> for PredicatePolarity
source§impl Hash for PredicatePolarity
impl Hash for PredicatePolarity
source§impl<__CTX> HashStable<__CTX> for PredicatePolarity
impl<__CTX> HashStable<__CTX> for PredicatePolarity
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
source§impl Ord for PredicatePolarity
impl Ord for PredicatePolarity
source§fn cmp(&self, other: &PredicatePolarity) -> Ordering
fn cmp(&self, other: &PredicatePolarity) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Compares and returns the maximum of two values. Read more
source§impl PartialEq for PredicatePolarity
impl PartialEq for PredicatePolarity
source§impl PartialOrd for PredicatePolarity
impl PartialOrd for PredicatePolarity
source§impl<I: Interner> Relate<I> for PredicatePolarity
impl<I: Interner> Relate<I> for PredicatePolarity
fn relate<R: TypeRelation<I>>( _relation: &mut R, a: PredicatePolarity, b: PredicatePolarity, ) -> RelateResult<I, PredicatePolarity>
source§impl<I: Interner> TypeFoldable<I> for PredicatePolarity
impl<I: Interner> TypeFoldable<I> for PredicatePolarity
source§fn try_fold_with<F: FallibleTypeFolder<I>>(
self,
_: &mut F,
) -> Result<Self, F::Error>
fn try_fold_with<F: FallibleTypeFolder<I>>( self, _: &mut F, ) -> Result<Self, F::Error>
source§fn fold_with<F: TypeFolder<I>>(self, _: &mut F) -> Self
fn fold_with<F: TypeFolder<I>>(self, _: &mut F) -> Self
A convenient alternative to
try_fold_with
for use with infallible
folders. Do not override this method, to ensure coherence with
try_fold_with
.source§impl<I: Interner> TypeVisitable<I> for PredicatePolarity
impl<I: Interner> TypeVisitable<I> for PredicatePolarity
source§fn visit_with<F: TypeVisitor<I>>(&self, _: &mut F) -> F::Result
fn visit_with<F: TypeVisitor<I>>(&self, _: &mut F) -> F::Result
impl Copy for PredicatePolarity
impl Eq for PredicatePolarity
impl StructuralPartialEq for PredicatePolarity
Auto Trait Implementations§
impl Freeze for PredicatePolarity
impl RefUnwindSafe for PredicatePolarity
impl Send for PredicatePolarity
impl Sync for PredicatePolarity
impl Unpin for PredicatePolarity
impl UnwindSafe for PredicatePolarity
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§impl<I, T> TypeVisitableExt<I> for Twhere
I: Interner,
T: TypeVisitable<I>,
impl<I, T> TypeVisitableExt<I> for Twhere
I: Interner,
T: TypeVisitable<I>,
fn has_type_flags(&self, flags: TypeFlags) -> bool
source§fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
Returns
true
if self
has any late-bound regions that are either
bound by binder
or bound by some binder outside of binder
.
If binder
is ty::INNERMOST
, this indicates whether
there are any late-bound regions that appear free.fn error_reported(&self) -> Result<(), <I as Interner>::ErrorGuaranteed>
source§fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
Returns
true
if this type has any regions that escape binder
(and
hence are not bound by it).source§fn has_escaping_bound_vars(&self) -> bool
fn has_escaping_bound_vars(&self) -> bool
Return
true
if this type has regions that are not a part of the type.
For example, for<'a> fn(&'a i32)
return false
, while fn(&'a i32)
would return true
. The latter can occur when traversing through the
former. Read morefn has_aliases(&self) -> bool
fn has_opaque_types(&self) -> bool
fn has_coroutines(&self) -> bool
fn references_error(&self) -> bool
fn has_non_region_param(&self) -> bool
fn has_infer_regions(&self) -> bool
fn has_infer_types(&self) -> bool
fn has_non_region_infer(&self) -> bool
fn has_infer(&self) -> bool
fn has_placeholders(&self) -> bool
fn has_non_region_placeholders(&self) -> bool
fn has_param(&self) -> bool
source§fn has_free_regions(&self) -> bool
fn has_free_regions(&self) -> bool
“Free” regions in this context means that it has any region
that is not (a) erased or (b) late-bound.
fn has_erased_regions(&self) -> bool
source§fn has_erasable_regions(&self) -> bool
fn has_erasable_regions(&self) -> bool
True if there are any un-erased free regions.
source§fn is_global(&self) -> bool
fn is_global(&self) -> bool
Indicates whether this value references only ‘global’
generic parameters that are the same regardless of what fn we are
in. This is used for caching.
source§fn has_bound_regions(&self) -> bool
fn has_bound_regions(&self) -> bool
True if there are any late-bound regions
source§fn has_non_region_bound_vars(&self) -> bool
fn has_non_region_bound_vars(&self) -> bool
True if there are any late-bound non-region variables
source§fn has_bound_vars(&self) -> bool
fn has_bound_vars(&self) -> bool
True if there are any bound variables
source§fn still_further_specializable(&self) -> bool
fn still_further_specializable(&self) -> bool
Indicates whether this value still has parameters/placeholders/inference variables
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impl
specialization.source§impl<I, T, U> Upcast<I, U> for Twhere
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source§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
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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: 1 byte
Size for each variant:
Positive
: 0 bytesNegative
: 0 bytes