Enum rustc_ast::ast::MetaItemKind

pub enum MetaItemKind {
    Word,
    List(Vec<NestedMetaItem>),
    NameValue(Lit),
}

A compile-time attribute item.

E.g., #[test], #[derive(..)] or #[feature = "foo"].

Variants

Word

Word meta item.

E.g., test as in #[test].

List(Vec<NestedMetaItem>)

List meta item.

E.g., derive(..) as in #[derive(..)].

NameValue(Lit)

Name value meta item.

E.g., feature = "foo" as in #[feature = "foo"].

Implementations

impl MetaItemKind

pub fn value_str(&self) -> Option<Symbol>

pub fn attr_args(&self, span: Span) -> AttrArgs

fn token_trees(&self, span: Span) -> Vec<TokenTree>

fn list_from_tokens(tokens: TokenStream) -> Option<MetaItemKind>

fn name_value_from_tokens(
    tokens: &mut impl Iterator<Item = TokenTree>
) -> Option<MetaItemKind>

fn from_attr_args(args: &AttrArgs) -> Option<MetaItemKind>

fn from_tokens(
    tokens: &mut Peekable<impl Iterator<Item = TokenTree>>
) -> Option<MetaItemKind>

Trait Implementations

impl Clone for MetaItemKind

fn clone(&self) -> MetaItemKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for MetaItemKind

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

Formats the value using the given formatter.

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

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

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

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

impl<__CTX> HashStable<__CTX> for MetaItemKindwhere
    __CTX: HashStableContext,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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

Size for each variant:

• Word: 0 bytes
• List: 24 bytes
• NameValue: 48 bytes