Struct rustc_ast::ast::Pat

pub struct Pat {
    pub id: NodeId,
    pub kind: PatKind,
    pub span: Span,
    pub tokens: Option<LazyTokenStream>,
}

A match pattern.

Patterns appear in match statements and some other contexts, such as let and if let.

Fields

id: NodeId

kind: PatKind

span: Span

tokens: Option<LazyTokenStream>

Implementations

impl Pat

pub fn to_ty(&self) -> Option<P<Ty>>

Attempt reparsing the pattern as a type. This is intended for use by diagnostics.

pub fn walk(&self, it: &mut impl FnMut(&Pat) -> bool)

Walk top-down and call it in each place where a pattern occurs starting with the root pattern walk is called on. If it returns false then we will descend no further but siblings will be processed.

pub fn is_rest(&self) -> bool

Is this a .. pattern?

Trait Implementations

impl AstLike for Pat

const SUPPORTS_CUSTOM_INNER_ATTRS: bool

This is true if this AstLike 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 Vec<Attribute>))

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

impl Clone for Pat

fn clone(&self) -> Pat

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Pat

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

Formats the value using the given formatter.

impl<__D: Decoder> Decodable<__D> for Pat

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

impl<__E: Encoder> Encodable<__E> for Pat

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

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: 120 bytes