Struct Field 

pub struct Field {
    pub name: Option<Ident>,
    pub index: usize,
    pub ty: TypeRef,
    pub origin: Origin<Field>,
}

One field of a Struct or of an Alternative.

Fields

name: Option<Ident>

The field’s name, or None for a positional one.

index: usize

Position within its struct or alternative, 0..N-1 — the same fact an Alternative carries.

The address of a positional field. A named field has one too, and simply does not need it: it is addressed by name, so this is available rather than used — the same way it carries its item’s location.

ty: TypeRef

origin: Origin<Field>

The field as written — pub id: u64, attributes and docs included.

Implementations

impl Field

pub fn docs(&self) -> Option<String>

This item’s /// documentation.

impl Field

pub fn member(&self) -> Member

How the field is addressed in a pattern or an initializer: by name when it has one, else by position.

Ungated, and the reason is what it reads: name and index, both model facts. No captured syntax is involved, so this is not a door — unlike the spell methods above, which read the delimiters the source wrote and are Emit::shape’s to hand out.

pub fn bind(&self, bind: &impl ToTokens) -> TokenStream

The field bound to bind, shaped for whichever address it uses — id: __f0 for a named field, __f0 for a positional one. The part a spelled fields list is built from.

Trait Implementations

impl Clone for Field

fn clone(&self) -> Field

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Field

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

Formats the value using the given formatter.