Enum rustc_infer::infer::region_constraints::VerifyBound
source · pub enum VerifyBound<'tcx> {
IfEq(Binder<'tcx, VerifyIfEq<'tcx>>),
OutlivedBy(Region<'tcx>),
IsEmpty,
AnyBound(Vec<VerifyBound<'tcx>>),
AllBounds(Vec<VerifyBound<'tcx>>),
}
Expand description
Describes the things that some GenericKind
value G
is known to
outlive. Each variant of VerifyBound
can be thought of as a
function:
fn(min: Region) -> bool { .. }
where true
means that the region min
meets that G: min
.
(False means nothing.)
So, for example, if we have the type T
and we have in scope that
T: 'a
and T: 'b
, then the verify bound might be:
fn(min: Region) -> bool {
('a: min) || ('b: min)
}
This is described with an AnyRegion('a, 'b)
node.
Variants§
IfEq(Binder<'tcx, VerifyIfEq<'tcx>>)
See VerifyIfEq
docs
OutlivedBy(Region<'tcx>)
Given a region R
, expands to the function:
fn(min) -> bool {
R: min
}
This is used when we can establish that G: R
– therefore,
if R: min
, then by transitivity G: min
.
IsEmpty
Given a region R
, true if it is 'empty
.
AnyBound(Vec<VerifyBound<'tcx>>)
Given a set of bounds B
, expands to the function:
fn(min) -> bool {
exists (b in B) { b(min) }
}
In other words, if we meet some bound in B
, that suffices.
This is used when all the bounds in B
are known to apply to G
.
AllBounds(Vec<VerifyBound<'tcx>>)
Given a set of bounds B
, expands to the function:
fn(min) -> bool {
forall (b in B) { b(min) }
}
In other words, if we meet all bounds in B
, that suffices.
This is used when some bound in B
is known to suffice, but
we don’t know which.
Implementations§
source§impl<'tcx> VerifyBound<'tcx>
impl<'tcx> VerifyBound<'tcx>
pub fn must_hold(&self) -> bool
pub fn cannot_hold(&self) -> bool
pub fn or(self, vb: VerifyBound<'tcx>) -> VerifyBound<'tcx>
Trait Implementations§
source§impl<'tcx> Clone for VerifyBound<'tcx>
impl<'tcx> Clone for VerifyBound<'tcx>
source§fn clone(&self) -> VerifyBound<'tcx>
fn clone(&self) -> VerifyBound<'tcx>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl<'tcx> Debug for VerifyBound<'tcx>
impl<'tcx> Debug for VerifyBound<'tcx>
source§impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for VerifyBound<'tcx>
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for VerifyBound<'tcx>
source§fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
__folder: &mut __F,
) -> Result<Self, __F::Error>
fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, __folder: &mut __F, ) -> Result<Self, __F::Error>
source§fn fold_with<F>(self, folder: &mut F) -> Selfwhere
F: TypeFolder<I>,
fn fold_with<F>(self, folder: &mut F) -> Selfwhere
F: TypeFolder<I>,
try_fold_with
for use with infallible
folders. Do not override this method, to ensure coherence with
try_fold_with
.source§impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for VerifyBound<'tcx>
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for VerifyBound<'tcx>
source§fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>(
&self,
__visitor: &mut __V,
) -> __V::Result
fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>( &self, __visitor: &mut __V, ) -> __V::Result
Auto Trait Implementations§
impl<'tcx> Freeze for VerifyBound<'tcx>
impl<'tcx> !RefUnwindSafe for VerifyBound<'tcx>
impl<'tcx> Send for VerifyBound<'tcx>
impl<'tcx> Sync for VerifyBound<'tcx>
impl<'tcx> Unpin for VerifyBound<'tcx>
impl<'tcx> !UnwindSafe for VerifyBound<'tcx>
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
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)
clone_to_uninit
)source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<T> Filterable for T
impl<T> Filterable for T
source§fn filterable(
self,
filter_name: &'static str,
) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
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>
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>
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<P> IntoQueryParam<P> for P
impl<P> IntoQueryParam<P> for P
fn into_query_param(self) -> P
source§impl<'tcx, T> IsSuggestable<'tcx> for T
impl<'tcx, T> IsSuggestable<'tcx> for T
source§impl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
source§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
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
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
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
fn has_erased_regions(&self) -> bool
source§fn has_erasable_regions(&self) -> bool
fn has_erasable_regions(&self) -> bool
source§fn is_global(&self) -> bool
fn is_global(&self) -> bool
source§fn has_bound_regions(&self) -> bool
fn has_bound_regions(&self) -> bool
source§fn has_non_region_bound_vars(&self) -> bool
fn has_non_region_bound_vars(&self) -> bool
source§fn has_bound_vars(&self) -> bool
fn has_bound_vars(&self) -> bool
source§fn still_further_specializable(&self) -> bool
fn still_further_specializable(&self) -> bool
impl
specialization.source§impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
source§impl<I, T> UpcastFrom<I, T> for T
impl<I, T> UpcastFrom<I, T> for T
fn upcast_from(from: T, _tcx: I) -> T
source§impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T
source§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
impl<T> ErasedDestructor for Twhere
T: 'static,
impl<T> MaybeSendSync for T
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: 32 bytes
Size for each variant:
IfEq
: 24 bytesOutlivedBy
: 8 bytesIsEmpty
: 0 bytesAnyBound
: 24 bytesAllBounds
: 24 bytes