Enum rustc::hir::BindingAnnotation

pub enum BindingAnnotation {
    Unannotated,
    Mutable,
    Ref,
    RefMut,
}

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Explicit binding annotations given in the HIR for a binding. Note that this is not the final binding mode that we infer after type inference.

Variants

Unannotated

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No binding annotation given: this means that the final binding mode will depend on whether we have skipped through a & reference when matching. For example, the x in Some(x) will have binding mode None; if you do let Some(x) = &Some(22), it will ultimately be inferred to be by-reference.

Note that implicit reference skipping is not implemented yet (#42640).

Mutable

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Annotated with mut x -- could be either ref or not, similar to None.

Ref

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Annotated as ref, like ref x

RefMut

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Annotated as ref mut x.

Trait Implementations

impl Clone for BindingAnnotation

fn clone(&self) -> BindingAnnotation

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq for BindingAnnotation

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

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

#[must_use] fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Encodable for BindingAnnotation

fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>

🔬 This is a nightly-only experimental API. (rustc_private)

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impl Decodable for BindingAnnotation

fn decode<__D: Decoder>(d: &mut __D) -> Result<BindingAnnotation, __D::Error>

🔬 This is a nightly-only experimental API. (rustc_private)

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impl Debug for BindingAnnotation

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

Formats the value using the given formatter.

impl Copy for BindingAnnotation

impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for BindingAnnotation

fn hash_stable<W: StableHasherResult>(     &self,     __ctx: &mut StableHashingContext<'a>,     __hasher: &mut StableHasher<W> )

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?