Enum rustc_resolve::late::LifetimeRibKind

enum LifetimeRibKind {
    Generics {
        binder: NodeId,
        span: Span,
        kind: LifetimeBinderKind,
    },
    AnonymousCreateParameter {
        binder: NodeId,
        report_in_path: bool,
    },
    Elided(LifetimeRes),
    AnonymousReportError,
    ElisionFailure,
    ConstGeneric,
    AnonConst,
    Item,
}

Variants

Generics

Fields

binder: NodeId

span: Span

kind: LifetimeBinderKind

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>).

ElisionFailure

Signal we cannot find which should be the anonymous lifetime.

ConstGeneric

FIXME(const_generics): This patches over an ICE caused by non-’static lifetimes in const generics. We are disallowing this until we can decide on how we want to handle non-’static lifetimes in const generics. See issue #74052 for discussion.

AnonConst

Non-static lifetimes are prohibited in anonymous constants under min_const_generics. This function will emit an error if generic_const_exprs is not enabled, the body identified by body_id is an anonymous constant and lifetime_ref is non-static.

Item

This rib acts as a barrier to forbid reference to lifetimes of a parent item.

Trait Implementations

impl Clone for LifetimeRibKind

fn clone(&self) -> LifetimeRibKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for LifetimeRibKind

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

Formats the value using the given formatter.

impl Copy for LifetimeRibKind

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
• ConstGeneric: 0 bytes
• AnonConst: 0 bytes
• Item: 0 bytes