# Struct rustc_ast::ast::Item

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    pub struct Item<K = ItemKind> {
        pub attrs: AttrVec,
        pub id: NodeId,
        pub span: Span,
        pub vis: Visibility,
        pub ident: Ident,
        pub kind: K,
        pub tokens: Option<LazyAttrTokenStream>,
    }

Expand description

An item definition.

## Fields§

§`attrs: AttrVec`§`id: NodeId`§`span: Span`§`vis: Visibility`§`ident: Ident`

The name of the item. It might be a dummy name in case of anonymous items.

§`kind: K`§`tokens: Option<LazyAttrTokenStream>`

Original tokens this item was parsed from. This isn’t necessarily available for all items, although over time more and more items should have this be `Some`. Right now this is primarily used for procedural macros, notably custom attributes.

Note that the tokens here do not include the outer attributes, but will include inner attributes.

## Implementations§

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### impl Item

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#### pub fn span_with_attributes(&self) -> Span

Return the span that encompasses the attributes.

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#### pub fn opt_generics(&self) -> Option<&Generics>

## Trait Implementations§

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### impl !AstDeref for Item

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#### type Target

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#### fn ast_deref(&self) -> &Self::Target

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#### fn ast_deref_mut(&mut self) -> &mut Self::Target

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### impl<K: Clone> Clone for Item<K>

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#### fn clone(&self) -> Item<K>

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<K: Debug> Debug for Item<K>

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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<K, __D: SpanDecoder> Decodable<__D> for Item<K>
where K: Decodable<__D>,

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

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### impl DummyAstNode for Item

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#### fn dummy() -> Self

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### impl<K, __E: SpanEncoder> Encodable<__E> for Item<K>
where K: Encodable<__E>,

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

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### impl HasAttrs for Item

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#### const SUPPORTS_CUSTOM_INNER_ATTRS: bool = true

This is `true` if this `HasAttrs` might support ‘custom’ (proc-macro) inner attributes. Attributes like `#![cfg]` and `#![cfg_attr]` are not considered ‘custom’ attributes. Read more
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#### fn attrs(&self) -> &[Attribute]

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#### fn visit_attrs(&mut self, f: impl FnOnce(&mut AttrVec))

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### impl HasNodeId for Item

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#### fn node_id(&self) -> NodeId

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#### fn node_id_mut(&mut self) -> &mut NodeId

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### impl HasSpan for Item

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#### fn span(&self) -> Span

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### impl HasTokens for Item

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#### fn tokens(&self) -> Option<&LazyAttrTokenStream>

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#### fn tokens_mut(&mut self) -> Option<&mut Option<LazyAttrTokenStream>>

## Auto Trait Implementations§

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### impl<K> DynSend for Item<K>
where K: DynSend,

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### impl<K> DynSync for Item<K>
where K: DynSync,

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### impl<K> Freeze for Item<K>
where K: Freeze,

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### impl<K = ItemKind> !RefUnwindSafe for Item<K>

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### impl<K = ItemKind> !Send for Item<K>

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### impl<K = ItemKind> !Sync for Item<K>

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### impl<K> Unpin for Item<K>
where K: Unpin,

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### impl<K = ItemKind> !UnwindSafe for Item<K>

## 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> 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: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.