# Enum rustc_ast::ast::ItemKind

source ·

    pub enum ItemKind {
    Show 18 variants    ExternCrate(Option<Symbol>),
        Use(UseTree),
        Static(Box<StaticItem>),
        Const(Box<ConstItem>),
        Fn(Box<Fn>),
        Mod(Unsafe, ModKind),
        ForeignMod(ForeignMod),
        GlobalAsm(Box<InlineAsm>),
        TyAlias(Box<TyAlias>),
        Enum(EnumDef, Generics),
        Struct(VariantData, Generics),
        Union(VariantData, Generics),
        Trait(Box<Trait>),
        TraitAlias(Generics, GenericBounds),
        Impl(Box<Impl>),
        MacCall(P<MacCall>),
        MacroDef(MacroDef),
        Delegation(Box<Delegation>),
    }

## Variants§

§

### ExternCrate(Option<Symbol>)

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`.

§

### Use(UseTree)

A use declaration item (`use`).

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

§

### Static(Box<StaticItem>)

A static item (`static`).

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

§

### Const(Box<ConstItem>)

A constant item (`const`).

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

§

### Fn(Box<Fn>)

A function declaration (`fn`).

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

§

### Mod(Unsafe, 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.

§

### ForeignMod(ForeignMod)

An external module (`extern`).

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

§

### GlobalAsm(Box<InlineAsm>)

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

§

### TyAlias(Box<TyAlias>)

A type alias (`type`).

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

§

### Enum(EnumDef, Generics)

An enum definition (`enum`).

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

§

### Struct(VariantData, Generics)

A struct definition (`struct`).

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

§

### Union(VariantData, Generics)

A union definition (`union`).

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

§

### Trait(Box<Trait>)

A trait declaration (`trait`).

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

§

### TraitAlias(Generics, GenericBounds)

Trait alias

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

§

### Impl(Box<Impl>)

An implementation.

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

§

### MacCall(P<MacCall>)

A macro invocation.

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

§

### MacroDef(MacroDef)

A macro definition.

§

### Delegation(Box<Delegation>)

A delegation item (`reuse`).

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

## Implementations§

source§

### impl ItemKind

source

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

source

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

source

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

## Trait Implementations§

source§

### impl Clone for ItemKind

source§

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

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
source§

### impl Debug for ItemKind

source§

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

Formats the value using the given formatter. Read more
source§

### impl<__D: SpanDecoder> Decodable<__D> for ItemKind

source§

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

source§

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

source§

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

source§

### impl From<AssocItemKind> for ItemKind

source§

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

Converts to this type from the input type.
source§

### impl From<ForeignItemKind> for ItemKind

source§

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

Converts to this type from the input type.
source§

### impl TryFrom<ItemKind> for AssocItemKind

§

#### type Error = ItemKind

The type returned in the event of a conversion error.
source§

#### fn try_from(item_kind: ItemKind) -> Result<AssocItemKind, ItemKind>

Performs the conversion.
source§

### impl TryFrom<ItemKind> for ForeignItemKind

§

#### type Error = ItemKind

The type returned in the event of a conversion error.
source§

#### fn try_from(item_kind: ItemKind) -> Result<ForeignItemKind, ItemKind>

Performs the conversion.

## Auto Trait Implementations§

§

### impl DynSend for ItemKind

§

### impl DynSync for ItemKind

§

### impl Freeze for ItemKind

§

### impl !RefUnwindSafe for ItemKind

§

### impl !Send for ItemKind

§

### impl !Sync for ItemKind

§

### impl Unpin for ItemKind

§

### impl !UnwindSafe for ItemKind

## Blanket Implementations§

source§

### impl<T> Aligned for T

source§

#### const ALIGN: Alignment = _

Alignment of `Self`.
source§

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

source§

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
source§

### impl<T> Borrow<T> for T
where T: ?Sized,

source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

### impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

### impl<T> From<T> for T

source§

#### fn from(t: T) -> T

Returns the argument unchanged.

source§

### impl<T> Instrument for T

source§

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

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
source§

#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
source§

### impl<T, U> Into<U> for T
where U: From<T>,

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.

§

### impl<T> Pointable for T

§

#### const ALIGN: usize = _

The alignment of pointer.
§

#### type Init = T

The type for initializers.
§

#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
§

#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
§

#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
§

#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
source§

### impl<T> Same for T

§

#### type Output = T

Should always be `Self`
source§

### impl<T> ToOwned for T
where T: Clone,

§

#### type Owned = T

The resulting type after obtaining ownership.
source§

#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

### impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

#### type Error = Infallible

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

### impl<T> WithSubscriber for T

source§

#### 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
source§

#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
source§

### 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: 64 bytes

Size for each variant:

- `ExternCrate`: 12 bytes
- `Use`: 56 bytes
- `Static`: 16 bytes
- `Const`: 16 bytes
- `Fn`: 16 bytes
- `Mod`: 56 bytes
- `ForeignMod`: 56 bytes
- `GlobalAsm`: 16 bytes
- `TyAlias`: 16 bytes
- `Enum`: 56 bytes
- `Struct`: 64 bytes
- `Union`: 64 bytes
- `Trait`: 16 bytes
- `TraitAlias`: 64 bytes
- `Impl`: 16 bytes
- `MacCall`: 16 bytes
- `MacroDef`: 24 bytes
- `Delegation`: 16 bytes