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

Values inside meta item lists.

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

Variants§

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MetaItem(MetaItem)

A full MetaItem, for recursive meta items.

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Lit(MetaItemLit)

A literal.

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

Implementations§

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impl NestedMetaItem

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

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

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

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

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

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

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

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

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pub fn name_or_empty(&self) -> Symbol

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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.

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

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

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

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

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pub fn is_meta_item(&self) -> bool

Returns true if the variant is MetaItem.

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pub fn is_word(&self) -> bool

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

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

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impl NestedMetaItem

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pub fn span(&self) -> Span

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

Trait Implementations§

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impl Clone for NestedMetaItem

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fn clone(&self) -> NestedMetaItem

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
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impl Debug for NestedMetaItem

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

Formats the value using the given formatter. Read more
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impl<__D: Decoder> Decodable<__D> for NestedMetaItem

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

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

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

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

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

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere
    T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere
    T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere
    T: ?Sized,

const: unstable · source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere
    U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere
    T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere
    U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere
    U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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: 72 bytes

Size for each variant:

  • MetaItem: 72 bytes
  • Lit: 40 bytes