Enum rustc_ast::ast::NestedMetaItem

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

Values inside meta item lists.

E.g., each of Clone, Copy in #[derive(Clone, Copy)].

Variants

MetaItem(MetaItem)

A full MetaItem, for recursive meta items.

Lit(MetaItemLit)

A literal.

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

Implementations

impl NestedMetaItem

pub fn span(&self) -> Span

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

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

pub fn is_word(&self) -> bool

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

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

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

pub fn singleton_lit_list(&self) -> Option<(Symbol, &MetaItemLit)>

If it’s a singleton list of the form foo(lit), returns the foo and the lit.

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

See MetaItem::name_value_literal_span.

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 lit(&self) -> Option<&MetaItemLit>

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

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

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

pub fn is_meta_item(&self) -> bool

Returns true if the variant is MetaItem.

fn from_tokens<'a, I>(tokens: &mut Peekable<I>) -> Option<NestedMetaItem>

where I: Iterator<Item = &'a 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: SpanDecoder> Decodable<__D> for NestedMetaItem

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

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

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

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: 88 bytes

Size for each variant:

• MetaItem: 88 bytes
• Lit: 40 bytes