Skip to main content

## LifetimeRibKind

# Enum LifetimeRibKind

Source

    enum LifetimeRibKind {
        Generics {
            binder: NodeId,
            span: Span,
            kind: LifetimeBinderKind,
        },
        AnonymousCreateParameter {
            binder: NodeId,
            report_in_path: bool,
        },
        Elided {
            res: LifetimeRes,
            error_in_path: bool,
        },
        AnonymousReportError,
        ElisionFailure,
        ConstParamTy,
        ConcreteAnonConst(NoConstantGenericsReason),
        Item,
        ImplTrait,
    }

## Variants§

§

### Generics

This rib declares generic parameters. Only for this kind the `LifetimeRib::bindings` field can be non-empty.

#### Fields

§`binder: NodeId`
§`span: Span`
§`kind: LifetimeBinderKind`
§

### 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<'_>) {}

#### Fields

§`binder: NodeId`
§`report_in_path: bool`
§

### Elided

Replace all anonymous lifetimes by provided lifetime.

#### Fields

§`res: LifetimeRes`
§`error_in_path: bool`

Always report those lifetimes as an error if in a path

§

### 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>`).

§

### 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.

§

### ImplTrait

Lifetimes cannot be elided in `impl Trait` types without `#![feature(anonymous_lifetime_in_impl_trait)]`.

## Implementations§

Source§

### impl LifetimeRibKind

Source

#### fn elided(res: LifetimeRes) -> LifetimeRibKind

Convenience function for creating non-erroring `Elided` variants.

## Trait Implementations§

Source§

### impl Clone for LifetimeRibKind

Source§

#### fn clone(&self) -> LifetimeRibKind

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
Source§

### impl Copy for LifetimeRibKind

Source§

### impl Debug for LifetimeRibKind

Source§

#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

§

### impl DynSend for LifetimeRibKind

§

### impl DynSync for LifetimeRibKind

§

### impl Freeze for LifetimeRibKind

§

### impl RefUnwindSafe for LifetimeRibKind

§

### impl Send for LifetimeRibKind

§

### impl Sync for LifetimeRibKind

§

### impl Unpin for LifetimeRibKind

§

### impl UnsafeUnpin for LifetimeRibKind

§

### impl UnwindSafe for LifetimeRibKind

## Blanket Implementations§

Source§

### impl<T> Aligned for T

Source§

#### const ALIGN: Alignment

Alignment of `Self`.
Source§

### impl<T> Any for T
where T: 'static + ?Sized,

Source§

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
Source§

### impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

Source§

#### fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T

Source§

#### fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]

Source§

### impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

Source§

#### fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T

Source§

#### fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]

Source§

### impl<T> Borrow<T> for T
where T: ?Sized,

Source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

### impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

### impl<T> CloneToUninit for T
where T: Clone,

Source§

#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. Read more
Source§

### impl<T, R> CollectAndApply<T, R> for T

Source§

#### fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to `f(&iter.collect::<Vec<_>>())`.

Source§

#### type Output = R

Source§

### impl<T> DynClone for T
where T: Clone,

Source§

#### fn __clone_box(&self, _: Private) -> *mut ()

Source§

### impl<T> ErasedDestructor for T
where T: 'static,

Source§

### impl<T> From<T> for T

Source§

#### fn from(t: T) -> T

Returns the argument unchanged.

Source§

### impl<T> Instrument for T

Source§

#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
Source§

#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
Source§

### impl<T, U> Into<U> for T
where U: From<T>,

Source§

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

Source§

### impl<T> IntoEither for T

Source§

#### 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 more
Source§

#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

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 more
Source§

### impl<K> IntoQueryKey<K> for K

Source§

#### fn into_query_key(self) -> K

Argument conversion from `Self` to `K`. This should always be a very cheap conversion, e.g. `LocalDefId::to_def_id`.
Source§

### impl<T> MaybeResult<T> for T

Source§

#### type Error = !

Source§

#### fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

Source§

#### fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

Source§

### impl<T> Pointable for T

Source§

#### const ALIGN: usize

The alignment of pointer.
Source§

#### type Init = T

The type for initializers.
Source§

#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
Source§

#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
Source§

#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
Source§

#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
Source§

### impl<T> Same for T

Source§

#### type Output = T

Should always be `Self`
Source§

### impl<T> ToOwned for T
where T: Clone,

Source§

#### type Owned = T

The resulting type after obtaining ownership.
Source§

#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
Source§

#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
Source§

### impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

#### type Error = Infallible

The type returned in the event of a conversion error.
Source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
Source§

### impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

Source§

#### fn upcast(self, interner: I) -> U

Source§

### impl<I, T> UpcastFrom<I, T> for T

Source§

#### fn upcast_from(from: T, _tcx: I) -> T

Source§

### impl<V, T> VZip<V> for T
where V: MultiLane<T>,

Source§

#### fn vzip(self) -> V

Source§

### impl<T> WithSubscriber for T

Source§

#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
Source§

#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more

## 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 bytes
- `AnonymousCreateParameter`: 7 bytes
- `Elided`: 15 bytes
- `AnonymousReportError`: 0 bytes
- `ElisionFailure`: 0 bytes
- `ConstParamTy`: 0 bytes
- `ConcreteAnonConst`: 1 byte
- `Item`: 0 bytes
- `ImplTrait`: 0 bytes