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

Variants§

§

Generics

Fields

§binder: NodeId
§span: Span

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

§

AnonymousCreateParameter

Fields

§binder: NodeId
§report_in_path: bool

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>).

§

AnonymousWarn(NodeId)

Resolves elided lifetimes to 'static, but gives a warning that this behavior is a bug and will be reverted soon.

§

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

source§

fn clone(&self) -> LifetimeRibKind

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
source§

impl Debug for LifetimeRibKind

source§

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

Formats the value using the given formatter. Read more
source§

impl Copy for LifetimeRibKind

Auto Trait Implementations§

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for Twhere 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> ToOwned for Twhere T: Clone,

§

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 Twhere U: Into<T>,

§

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 Twhere U: TryFrom<T>,

§

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.

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
  • AnonymousWarn: 7 bytes
  • ElisionFailure: 0 bytes
  • ConstParamTy: 0 bytes
  • ConcreteAnonConst: 1 byte
  • Item: 0 bytes