Struct Alternative 

pub struct Alternative {
    pub name: Ident,
    pub index: usize,
    pub fields: Vec<Field>,
    pub origin: Origin<Variant>,
}

One alternative of a Variant.

Fields

name: Ident

index: usize

Position within its sum, 0..N-1 — the same fact a Field carries, for the same reason: a node handed out on its own still knows where it sits.

This is the only numbering a sum has. What a destination language does with it is its own business: one may transmit it to say which alternative is live, another may send a name instead.

fields: Vec<Field>

The alternative’s payload, in declaration order. May be empty — a sum can mix payload-carrying and payload-free alternatives, and only the presence of some payload makes the type a Variant.

origin: Origin<Variant>

The alternative as written: delimiters, attributes, doc comments.

Implementations

impl Alternative

pub fn is_empty(&self) -> bool

True when this alternative carries no payload.

The group question, not the syntax one: B, B() and B {} are all empty by this test; what keeps their delimiters apart is the spelling, not this.

impl Alternative

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

This item’s /// documentation.

Trait Implementations

impl Clone for Alternative

fn clone(&self) -> Alternative

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Alternative

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

Formats the value using the given formatter.