Struct rustc_ast::ast::Arm

pub struct Arm {
    pub attrs: AttrVec,
    pub pat: P<Pat>,
    pub guard: Option<P<Expr>>,
    pub body: Option<P<Expr>>,
    pub span: Span,
    pub id: NodeId,
    pub is_placeholder: bool,
}

An arm of a ‘match’.

E.g., 0..=10 => { println!("match!") } as in

match 123 {
    0..=10 => { println!("match!") },
    _ => { println!("no match!") },
}

Fields

attrs: AttrVec

pat: P<Pat>

Match arm pattern, e.g. 10 in match foo { 10 => {}, _ => {} }.

guard: Option<P<Expr>>

Match arm guard, e.g. n > 10 in match foo { n if n > 10 => {}, _ => {} }.

body: Option<P<Expr>>

Match arm body. Omitted if the pattern is a never pattern.

span: Span

id: NodeId

is_placeholder: bool

Trait Implementations

impl Clone for Arm

fn clone(&self) -> Arm

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Arm

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

Formats the value using the given formatter.

impl<__D: SpanDecoder> Decodable<__D> for Arm

fn decode(__decoder: &mut __D) -> Self

impl<__E: SpanEncoder> Encodable<__E> for Arm

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

impl HasAttrs for Arm

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

This is true if this HasAttrs might support ‘custom’ (proc-macro) inner attributes. Attributes like #![cfg] and #![cfg_attr] are not considered ‘custom’ attributes.

fn attrs(&self) -> &[Attribute]

fn visit_attrs(&mut self, f: impl FnOnce(&mut AttrVec))

impl HasNodeId for Arm

fn node_id(&self) -> NodeId

fn node_id_mut(&mut self) -> &mut NodeId

impl HasTokens for Arm

fn tokens(&self) -> Option<&LazyAttrTokenStream>

fn tokens_mut(&mut self) -> Option<&mut Option<LazyAttrTokenStream>>

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: 48 bytes