Struct rustc_middle::ty::Region
source · pub struct Region<'tcx>(pub Interned<'tcx, RegionKind<'tcx>>);
Expand description
Use this rather than RegionKind
, whenever possible.
Tuple Fields§
§0: Interned<'tcx, RegionKind<'tcx>>
Implementations§
source§impl<'tcx> Region<'tcx>
impl<'tcx> Region<'tcx>
pub fn new_early_bound( tcx: TyCtxt<'tcx>, early_bound_region: EarlyBoundRegion ) -> Region<'tcx>
pub fn new_late_bound( tcx: TyCtxt<'tcx>, debruijn: DebruijnIndex, bound_region: BoundRegion ) -> Region<'tcx>
pub fn new_free( tcx: TyCtxt<'tcx>, scope: DefId, bound_region: BoundRegionKind ) -> Region<'tcx>
pub fn new_var(tcx: TyCtxt<'tcx>, v: RegionVid) -> Region<'tcx>
pub fn new_placeholder( tcx: TyCtxt<'tcx>, placeholder: PlaceholderRegion ) -> Region<'tcx>
sourcepub fn new_error(tcx: TyCtxt<'tcx>, reported: ErrorGuaranteed) -> Region<'tcx>
pub fn new_error(tcx: TyCtxt<'tcx>, reported: ErrorGuaranteed) -> Region<'tcx>
Constructs a RegionKind::ReError
region.
sourcepub fn new_error_misc(tcx: TyCtxt<'tcx>) -> Region<'tcx>
pub fn new_error_misc(tcx: TyCtxt<'tcx>) -> Region<'tcx>
Constructs a RegionKind::ReError
region and registers a delay_span_bug
to ensure it
gets used.
sourcepub fn new_error_with_message<S: Into<MultiSpan>>(
tcx: TyCtxt<'tcx>,
span: S,
msg: &'static str
) -> Region<'tcx>
pub fn new_error_with_message<S: Into<MultiSpan>>( tcx: TyCtxt<'tcx>, span: S, msg: &'static str ) -> Region<'tcx>
Constructs a RegionKind::ReError
region and registers a delay_span_bug
with the given
msg
to ensure it gets used.
sourcepub fn new_from_kind(tcx: TyCtxt<'tcx>, kind: RegionKind<'tcx>) -> Region<'tcx>
pub fn new_from_kind(tcx: TyCtxt<'tcx>, kind: RegionKind<'tcx>) -> Region<'tcx>
Avoid this in favour of more specific new_*
methods, where possible,
to avoid the cost of the match
.
source§impl<'tcx> Region<'tcx>
impl<'tcx> Region<'tcx>
Region utilities
pub fn kind(self) -> RegionKind<'tcx>
pub fn get_name(self) -> Option<Symbol>
pub fn get_name_or_anon(self) -> Symbol
pub fn is_error(self) -> bool
pub fn is_static(self) -> bool
pub fn is_erased(self) -> bool
pub fn is_late_bound(self) -> bool
pub fn is_placeholder(self) -> bool
pub fn bound_at_or_above_binder(self, index: DebruijnIndex) -> bool
pub fn type_flags(self) -> TypeFlags
sourcepub fn free_region_binding_scope(self, tcx: TyCtxt<'_>) -> DefId
pub fn free_region_binding_scope(self, tcx: TyCtxt<'_>) -> DefId
Given an early-bound or free region, returns the DefId
where it was bound.
For example, consider the regions in this snippet of code:
impl<'a> Foo {
// ^^ -- early bound, declared on an impl
fn bar<'b, 'c>(x: &self, y: &'b u32, z: &'c u64) where 'static: 'c
// ^^ ^^ ^ anonymous, late-bound
// | early-bound, appears in where-clauses
// late-bound, appears only in fn args
{..}
}
Here, free_region_binding_scope('a)
would return the DefId
of the impl, and for all the other highlighted regions, it
would return the DefId
of the function. In other cases (not shown), this
function might return the DefId
of a closure.
sourcepub fn is_free_or_static(self) -> bool
pub fn is_free_or_static(self) -> bool
True if self
is a free region or static.
pub fn is_var(self) -> bool
pub fn as_var(self) -> RegionVid
Trait Implementations§
source§impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for Region<'tcx>
impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for Region<'tcx>
fn fmt<InfCtx: InferCtxtLike<TyCtxt<'tcx>>>( this: OptWithInfcx<'_, TyCtxt<'tcx>, InfCtx, &Self>, f: &mut Formatter<'_> ) -> Result
source§impl<'tcx> Deref for Region<'tcx>
impl<'tcx> Deref for Region<'tcx>
§type Target = RegionKind<TyCtxt<'tcx>>
type Target = RegionKind<TyCtxt<'tcx>>
source§fn deref(&self) -> &RegionKind<'tcx>
fn deref(&self) -> &RegionKind<'tcx>
source§impl<'tcx> From<Region<'tcx>> for GenericArg<'tcx>
impl<'tcx> From<Region<'tcx>> for GenericArg<'tcx>
source§fn from(r: Region<'tcx>) -> GenericArg<'tcx>
fn from(r: Region<'tcx>) -> GenericArg<'tcx>
source§impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for Region<'tcx>
impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for Region<'tcx>
fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )
source§impl<'tcx> Ord for Region<'tcx>
impl<'tcx> Ord for Region<'tcx>
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl<'tcx> PartialEq<Region<'tcx>> for Region<'tcx>
impl<'tcx> PartialEq<Region<'tcx>> for Region<'tcx>
source§impl<'tcx> PartialOrd<Region<'tcx>> for Region<'tcx>
impl<'tcx> PartialOrd<Region<'tcx>> for Region<'tcx>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl<'tcx> Relate<'tcx> for Region<'tcx>
impl<'tcx> Relate<'tcx> for Region<'tcx>
fn relate<R: TypeRelation<'tcx>>( relation: &mut R, a: Region<'tcx>, b: Region<'tcx> ) -> RelateResult<'tcx, Region<'tcx>>
source§impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for Region<'tcx>
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for Region<'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 Region<'tcx>
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for Region<'tcx>
source§fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>(
&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>( &self, visitor: &mut V ) -> ControlFlow<V::BreakTy>
impl<'tcx> Copy for Region<'tcx>
impl<'tcx> Eq for Region<'tcx>
impl<'tcx> StructuralEq for Region<'tcx>
impl<'tcx> StructuralPartialEq for Region<'tcx>
Auto Trait Implementations§
impl<'tcx> RefUnwindSafe for Region<'tcx>
impl<'tcx> Send for Region<'tcx>
impl<'tcx> Sync for Region<'tcx>
impl<'tcx> Unpin for Region<'tcx>
impl<'tcx> UnwindSafe for Region<'tcx>
Blanket Implementations§
source§impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere T: Copy,
fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T
fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]
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, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<Tcx, T> DepNodeParams<Tcx> for Twhere
Tcx: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
impl<Tcx, T> DepNodeParams<Tcx> for Twhere Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
default fn fingerprint_style() -> FingerprintStyle
source§default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
default fn to_debug_str(&self, _: Tcx) -> String
source§default fn recover(_: Tcx, _: &DepNode) -> Option<T>
default fn recover(_: Tcx, _: &DepNode) -> Option<T>
DepNode
,
something which is needed when forcing DepNode
s during red-green
evaluation. The query system will only call this method if
fingerprint_style()
is not FingerprintStyle::Opaque
.
It is always valid to return None
here, in which case incremental
compilation will treat the query as having changed instead of forcing it.source§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 Twhere
T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,
impl<'tcx, T> IsSuggestable<'tcx> for Twhere T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,
source§impl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
source§impl<'tcx, T> ToPredicate<'tcx, T> for T
impl<'tcx, T> ToPredicate<'tcx, T> for T
fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T
source§impl<'tcx, T> TypeVisitableExt<'tcx> for Twhere
T: TypeVisitable<TyCtxt<'tcx>>,
impl<'tcx, T> TypeVisitableExt<'tcx> for Twhere T: TypeVisitable<TyCtxt<'tcx>>,
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.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_type_flags(&self, flags: TypeFlags) -> bool
fn has_projections(&self) -> bool
fn has_inherent_projections(&self) -> bool
fn has_opaque_types(&self) -> bool
fn has_generators(&self) -> bool
fn references_error(&self) -> bool
fn error_reported(&self) -> Result<(), ErrorGuaranteed>
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_late_bound_regions(&self) -> bool
fn has_late_bound_regions(&self) -> bool
source§fn has_non_region_late_bound(&self) -> bool
fn has_non_region_late_bound(&self) -> bool
source§fn has_late_bound_vars(&self) -> bool
fn has_late_bound_vars(&self) -> bool
source§fn still_further_specializable(&self) -> bool
fn still_further_specializable(&self) -> bool
impl
specialization.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: &[QueryInfo], _guar: ErrorGuaranteed ) -> 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: 8 bytes