Enum rustc_ast::ast::NestedMetaItem

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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 span(&self) -> Span

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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 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 is_word(&self) -> bool

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

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

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

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

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

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

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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 is_meta_item(&self) -> bool

Returns true if the variant is MetaItem.

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fn from_tokens<'a, I>(tokens: &mut Peekable<I>) -> Option<NestedMetaItem>
where I: Iterator<Item = &'a 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
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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: SpanDecoder> Decodable<__D> for NestedMetaItem

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

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

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

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impl<__CTX> HashStable<__CTX> for NestedMetaItem
where __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> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where 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 T
where T: ?Sized,

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fn borrow(&self) -> &T

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

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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

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where 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 T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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 T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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