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
sourceimpl<'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
sourceimpl<'tcx> Clone for VerifyBound<'tcx>
impl<'tcx> Clone for VerifyBound<'tcx>
sourcefn clone(&self) -> VerifyBound<'tcx>
fn clone(&self) -> VerifyBound<'tcx>
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresourceimpl<'tcx> Debug for VerifyBound<'tcx>
impl<'tcx> Debug for VerifyBound<'tcx>
sourceimpl<'tcx> TypeFoldable<'tcx> for VerifyBound<'tcx>
impl<'tcx> TypeFoldable<'tcx> for VerifyBound<'tcx>
sourcefn try_fold_with<__F: FallibleTypeFolder<'tcx>>(
self,
__folder: &mut __F
) -> Result<Self, __F::Error>
fn try_fold_with<__F: FallibleTypeFolder<'tcx>>(
self,
__folder: &mut __F
) -> Result<Self, __F::Error>
sourcefn fold_with<F>(self, folder: &mut F) -> Selfwhere
F: TypeFolder<'tcx>,
fn fold_with<F>(self, folder: &mut F) -> Selfwhere
F: TypeFolder<'tcx>,
try_fold_with
for use with infallible
folders. Do not override this method, to ensure coherence with
try_fold_with
. Read moresourceimpl<'tcx> TypeVisitable<'tcx> for VerifyBound<'tcx>
impl<'tcx> TypeVisitable<'tcx> for VerifyBound<'tcx>
sourcefn visit_with<__V: TypeVisitor<'tcx>>(
&self,
__visitor: &mut __V
) -> ControlFlow<__V::BreakTy>
fn visit_with<__V: TypeVisitor<'tcx>>(
&self,
__visitor: &mut __V
) -> ControlFlow<__V::BreakTy>
sourcefn 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. Read moresourcefn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
true
if this self
has any regions that escape binder
(and
hence are not bound by it). Read morefn has_escaping_bound_vars(&self) -> bool
fn has_type_flags(&self, flags: TypeFlags) -> bool
fn has_projections(&self) -> bool
fn has_opaque_types(&self) -> bool
fn references_error(&self) -> bool
fn error_reported(&self) -> Option<ErrorGuaranteed>
fn has_param_types_or_consts(&self) -> bool
fn has_infer_regions(&self) -> bool
fn has_infer_types(&self) -> bool
fn has_infer_types_or_consts(&self) -> bool
fn needs_infer(&self) -> bool
fn has_placeholders(&self) -> bool
fn needs_subst(&self) -> bool
sourcefn has_free_regions(&self) -> bool
fn has_free_regions(&self) -> bool
fn has_erased_regions(&self) -> bool
sourcefn has_erasable_regions(&self) -> bool
fn has_erasable_regions(&self) -> bool
sourcefn is_global(&self) -> bool
fn is_global(&self) -> bool
sourcefn has_late_bound_regions(&self) -> bool
fn has_late_bound_regions(&self) -> bool
sourcefn still_further_specializable(&self) -> bool
fn still_further_specializable(&self) -> bool
impl
specialization. Read moreAuto Trait Implementations
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
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
sourceimpl<'tcx, T> IsSuggestable<'tcx> for Twhere
T: TypeVisitable<'tcx>,
impl<'tcx, T> IsSuggestable<'tcx> for Twhere
T: TypeVisitable<'tcx>,
impl<'a, T> Captures<'a> for Twhere
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: 32 bytes
Size for each variant:
IfEq
: 24 bytesOutlivedBy
: 8 bytesIsEmpty
: 0 bytesAnyBound
: 24 bytesAllBounds
: 24 bytes