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

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

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

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

Ref

Annotated as ref, like ref x

RefMut

Annotated as ref mut x.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

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

This method tests for !=.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The resulting type after obtaining ownership.

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

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

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

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion 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: 1 byte

Size for each variant:

  • Unannotated: 0 bytes
  • Mutable: 0 bytes
  • Ref: 0 bytes
  • RefMut: 0 bytes