Enum rustc_hir::hir::LifetimeName

pub enum LifetimeName {
    Param(LocalDefId),
    ImplicitObjectLifetimeDefault,
    Error,
    Infer,
    Static,
}

Variants

Param(LocalDefId)

User-given names or fresh (synthetic) names.

ImplicitObjectLifetimeDefault

Implicit lifetime in a context like dyn Foo. This is distinguished from implicit lifetimes elsewhere because the lifetime that they default to must appear elsewhere within the enclosing type. This means that, in an impl Trait context, we don’t have to create a parameter for them. That is, impl Trait<Item = &u32> expands to an opaque type like type Foo<'a> = impl Trait<Item = &'a u32>, but impl Trait<item = dyn Bar> expands to type Foo = impl Trait<Item = dyn Bar + 'static>. The latter uses ImplicitObjectLifetimeDefault so that surrounding code knows not to create a lifetime parameter.

Error

Indicates an error during lowering (usually '_ in wrong place) that was already reported.

Infer

User wrote an anonymous lifetime, either '_ or nothing. The semantics of this lifetime should be inferred by typechecking code.

Static

User wrote 'static.

Implementations

impl LifetimeName

pub fn is_elided(&self) -> bool

Trait Implementations

impl Clone for LifetimeName

fn clone(&self) -> LifetimeName

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for LifetimeName

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

Formats the value using the given formatter.

impl<__E: Encoder> Encodable<__E> for LifetimeName

fn encode(&self, __encoder: &mut __E)

impl Hash for LifetimeName

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<__CTX> HashStable<__CTX> for LifetimeNamewhere
    __CTX: HashStableContext,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl PartialEq<LifetimeName> for LifetimeName

fn eq(&self, other: &LifetimeName) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for LifetimeName

impl Eq for LifetimeName

impl StructuralEq for LifetimeName

impl StructuralPartialEq for LifetimeName

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: 4 bytes

Size for each variant:

• Param: 4 bytes
• ImplicitObjectLifetimeDefault: 0 bytes
• Error: 0 bytes
• Infer: 0 bytes
• Static: 0 bytes