Enum rustc_ast::ast::NestedMetaItem

pub enum NestedMetaItem {
    MetaItem(MetaItem),
    Literal(Lit),
}

Possible values inside of compile-time attribute lists.

E.g., the ‘..’ in #[name(..)].

Variants

MetaItem(MetaItem)

A full MetaItem, for recursive meta items.

Tuple Fields of MetaItem

0: MetaItem

Literal(Lit)

A literal.

E.g., "foo", 64, true.

Tuple Fields of Literal

0: Lit

Implementations

impl NestedMetaItem

pub fn meta_item(&self) -> Option<&MetaItem>

Returns the MetaItem if self is a NestedMetaItem::MetaItem.

pub fn literal(&self) -> Option<&Lit>

Returns the Lit if self is a NestedMetaItem::Literals.

pub fn has_name(&self, name: Symbol) -> bool

Returns true if this list item is a MetaItem with a name of name.

pub fn ident(&self) -> Option<Ident>

For a single-segment meta item, returns its name; otherwise, returns None.

pub fn name_or_empty(&self) -> Symbol

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

Gets the string value if self is a MetaItem and the MetaItem is a MetaItemKind::NameValue variant containing a string, otherwise None.

pub fn name_value_literal(&self) -> Option<(Symbol, &Lit)>

Returns a name and single literal value tuple of the MetaItem.

pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]>

Gets a list of inner meta items from a list MetaItem type.

pub fn is_meta_item(&self) -> bool

Returns true if the variant is MetaItem.

pub fn is_word(&self) -> bool

Returns true if self is a MetaItem and the meta item is a word.

pub fn name_value_literal_span(&self) -> Option<Span>

See MetaItem::name_value_literal_span.

impl NestedMetaItem

pub fn span(&self) -> Span

fn token_trees_and_spacings(&self) -> Vec<TreeAndSpacing>

fn from_tokens<I>(tokens: &mut Peekable<I>) -> Option<NestedMetaItem> where
    I: Iterator<Item = TokenTree>, 

Trait Implementations

impl Clone for NestedMetaItem

fn clone(&self) -> NestedMetaItem

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for NestedMetaItem

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

Formats the value using the given formatter.

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

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

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

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

impl<__CTX> HashStable<__CTX> for NestedMetaItem where
    __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: 112 bytes

Size for each variant:

• MetaItem: 104 bytes
• Literal: 48 bytes