ItemKind in rustc_ast::ast - Rust
Description: API documentation for the Rust `ItemKind` enum in crate `rustc_ast`.

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## ItemKind

# Enum ItemKind

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    pub enum ItemKind {
    Show 20 variants    ExternCrate(Option<Symbol>, Ident),
        Use(UseTree),
        Static(Box<StaticItem>),
        Const(Box<ConstItem>),
        ConstBlock(ConstBlockItem),
        Fn(Box<Fn>),
        Mod(Safety, Ident, ModKind),
        ForeignMod(ForeignMod),
        GlobalAsm(Box<InlineAsm>),
        TyAlias(Box<TyAlias>),
        Enum(Ident, Generics, EnumDef),
        Struct(Ident, Generics, VariantData),
        Union(Ident, Generics, VariantData),
        Trait(Box<Trait>),
        TraitAlias(Box<TraitAlias>),
        Impl(Impl),
        MacCall(Box<MacCall>),
        MacroDef(Ident, MacroDef),
        Delegation(Box<Delegation>),
        DelegationMac(Box<DelegationMac>),
    }

## Variants§

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### ExternCrate(Option<Symbol>, Ident)

An `extern crate` item, with the optional original crate name if the crate was renamed.

E.g., `extern crate foo` or `extern crate foo_bar as foo`.

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### Use(UseTree)

A use declaration item (`use`).

E.g., `use foo;`, `use foo::bar;` or `use foo::bar as FooBar;`.

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### Static(Box<StaticItem>)

A static item (`static`).

E.g., `static FOO: i32 = 42;` or `static FOO: &'static str = "bar";`.

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### Const(Box<ConstItem>)

A constant item (`const`).

E.g., `const FOO: i32 = 42;`.

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### ConstBlock(ConstBlockItem)

A module-level const block. Equivalent to `const _: () = const { ... };`.

E.g., `const { assert!(true) }`.

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### Fn(Box<Fn>)

A function declaration (`fn`).

E.g., `fn foo(bar: usize) -> usize { .. }`.

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### Mod(Safety, Ident, ModKind)

A module declaration (`mod`).

E.g., `mod foo;` or `mod foo { .. }`. `unsafe` keyword on modules is accepted syntactically for macro DSLs, but not semantically by Rust.

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### ForeignMod(ForeignMod)

An external module (`extern`).

E.g., `extern {}` or `extern "C" {}`.

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### GlobalAsm(Box<InlineAsm>)

Module-level inline assembly (from `global_asm!()`).

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### TyAlias(Box<TyAlias>)

A type alias (`type`).

E.g., `type Foo = Bar<u8>;`.

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### Enum(Ident, Generics, EnumDef)

An enum definition (`enum`).

E.g., `enum Foo<A, B> { C<A>, D<B> }`.

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### Struct(Ident, Generics, VariantData)

A struct definition (`struct`).

E.g., `struct Foo<A> { x: A }`.

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### Union(Ident, Generics, VariantData)

A union definition (`union`).

E.g., `union Foo<A, B> { x: A, y: B }`.

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### Trait(Box<Trait>)

A trait declaration (`trait`).

E.g., `trait Foo { .. }`, `trait Foo<T> { .. }` or `auto trait Foo {}`.

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### TraitAlias(Box<TraitAlias>)

Trait alias.

E.g., `trait Foo = Bar + Quux;`.

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### Impl(Impl)

An implementation.

E.g., `impl<A> Foo<A> { .. }` or `impl<A> Trait for Foo<A> { .. }`.

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### MacCall(Box<MacCall>)

A macro invocation.

E.g., `foo!(..)`.

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### MacroDef(Ident, MacroDef)

A macro definition.

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### Delegation(Box<Delegation>)

A single delegation item (`reuse`).

E.g. `reuse <Type as Trait>::name { target_expr_template }`.

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### DelegationMac(Box<DelegationMac>)

A list or glob delegation item (`reuse prefix::{a, b, c}`, `reuse prefix::*`). Treated similarly to a macro call and expanded early.

## Implementations§

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### impl ItemKind

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

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#### pub fn article(&self) -> &'static str

“a” or “an”

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#### pub fn descr(&self) -> &'static str

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

## Trait Implementations§

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### impl Clone for ItemKind

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#### fn clone(&self) -> ItemKind

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from `source`. Read more
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### impl Debug for ItemKind

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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 ItemKind

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

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### impl<__E: SpanEncoder> Encodable<__E> for ItemKind

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

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### impl From<AssocItemKind> for ItemKind

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#### fn from(assoc_item_kind: AssocItemKind) -> ItemKind

Converts to this type from the input type.
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### impl From<ForeignItemKind> for ItemKind

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#### fn from(foreign_item_kind: ForeignItemKind) -> ItemKind

Converts to this type from the input type.
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### impl TryFrom<ItemKind> for AssocItemKind

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#### type Error = ItemKind

The type returned in the event of a conversion error.
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#### fn try_from(item_kind: ItemKind) -> Result<AssocItemKind, ItemKind>

Performs the conversion.
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### impl TryFrom<ItemKind> for ForeignItemKind

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#### type Error = ItemKind

The type returned in the event of a conversion error.
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#### fn try_from(item_kind: ItemKind) -> Result<ForeignItemKind, ItemKind>

Performs the conversion.
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### impl WalkItemKind for ItemKind

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#### type Ctxt = ()

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#### fn walk<V: MutVisitor>( &mut self, attrs: &AttrVec, span: Span, id: NodeId, visibility: &mut Visibility, _ctxt: Self::Ctxt, vis: &mut V, ) -> V::Result

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### impl WalkItemKind for ItemKind

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#### type Ctxt = ()

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#### fn walk<'a, V: Visitor<'a>>( &'a self, attrs: &AttrVec, span: Span, id: NodeId, visibility: &'a Visibility, _ctxt: Self::Ctxt, vis: &mut V, ) -> V::Result

## Auto Trait Implementations§

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### impl DynSend for ItemKind

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### impl DynSync for ItemKind

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### impl Freeze for ItemKind

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### impl RefUnwindSafe for ItemKind

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### impl Send for ItemKind

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### impl Sync for ItemKind

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### impl Unpin for ItemKind

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### impl UnsafeUnpin for ItemKind

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### impl UnwindSafe for ItemKind

## 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> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. 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> MutVisitorResult for T

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#### type Result = ()

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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

## 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:

- `ExternCrate`: 16 bytes
- `Use`: 52 bytes
- `Static`: 12 bytes
- `Const`: 12 bytes
- `ConstBlock`: 28 bytes
- `Fn`: 12 bytes
- `Mod`: 60 bytes
- `ForeignMod`: 60 bytes
- `GlobalAsm`: 12 bytes
- `TyAlias`: 12 bytes
- `Enum`: 60 bytes
- `Struct`: 68 bytes
- `Union`: 68 bytes
- `Trait`: 12 bytes
- `TraitAlias`: 12 bytes
- `Impl`: 84 bytes
- `MacCall`: 12 bytes
- `MacroDef`: 60 bytes
- `Delegation`: 12 bytes
- `DelegationMac`: 12 bytes