Enum rustc_resolve::late::LifetimeRibKind
source · enum LifetimeRibKind {
Generics {
binder: NodeId,
span: Span,
kind: LifetimeBinderKind,
},
AnonymousCreateParameter {
binder: NodeId,
report_in_path: bool,
},
Elided(LifetimeRes),
AnonymousReportError,
StaticIfNoLifetimeInScope {
lint_id: NodeId,
emit_lint: bool,
},
ElisionFailure,
ConstParamTy,
ConcreteAnonConst(NoConstantGenericsReason),
Item,
}
Variants§
Generics
This rib declares generic parameters.
Only for this kind the LifetimeRib::bindings
field can be non-empty.
AnonymousCreateParameter
Create a new anonymous lifetime parameter and reference it.
If report_in_path
, report an error when encountering lifetime elision in a path:
struct Foo<'a> { x: &'a () }
async fn foo(x: Foo) {}
Note: the error should not trigger when the elided lifetime is in a pattern or expression-position path:
struct Foo<'a> { x: &'a () }
async fn foo(Foo { x: _ }: Foo<'_>) {}
Elided(LifetimeRes)
Replace all anonymous lifetimes by provided lifetime.
AnonymousReportError
Give a hard error when either &
or '_
is written. Used to
rule out things like where T: Foo<'_>
. Does not imply an
error on default object bounds (e.g., Box<dyn Foo>
).
StaticIfNoLifetimeInScope
Resolves elided lifetimes to 'static
if there are no other lifetimes in scope,
otherwise give a warning that the previous behavior of introducing a new early-bound
lifetime is a bug and will be removed (if emit_lint
is enabled).
ElisionFailure
Signal we cannot find which should be the anonymous lifetime.
ConstParamTy
This rib forbids usage of generic parameters inside of const parameter types.
While this is desirable to support eventually, it is difficult to do and so is currently forbidden. See rust-lang/project-const-generics#28 for more info.
ConcreteAnonConst(NoConstantGenericsReason)
Usage of generic parameters is forbidden in various positions for anon consts:
- const arguments when
generic_const_exprs
is not enabled - enum discriminant values
This rib emits an error when a lifetime would resolve to a lifetime parameter.
Item
This rib acts as a barrier to forbid reference to lifetimes of a parent item.
Trait Implementations§
source§impl Clone for LifetimeRibKind
impl Clone for LifetimeRibKind
source§fn clone(&self) -> LifetimeRibKind
fn clone(&self) -> LifetimeRibKind
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for LifetimeRibKind
impl Debug for LifetimeRibKind
impl Copy for LifetimeRibKind
Auto Trait Implementations§
impl Freeze for LifetimeRibKind
impl RefUnwindSafe for LifetimeRibKind
impl !Send for LifetimeRibKind
impl !Sync for LifetimeRibKind
impl Unpin for LifetimeRibKind
impl UnwindSafe for LifetimeRibKind
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<'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> 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<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
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: 16 bytes
Size for each variant:
Generics
: 15 bytesAnonymousCreateParameter
: 7 bytesElided
: 15 bytesAnonymousReportError
: 0 bytesStaticIfNoLifetimeInScope
: 7 bytesElisionFailure
: 0 bytesConstParamTy
: 0 bytesConcreteAnonConst
: 1 byteItem
: 0 bytes