# [−] [src] Enum syn::Item

    pub enum Item {
        Const(ItemConst),
        Enum(ItemEnum),
        ExternCrate(ItemExternCrate),
        Fn(ItemFn),
        ForeignMod(ItemForeignMod),
        Impl(ItemImpl),
        Macro(ItemMacro),
        Macro2(ItemMacro2),
        Mod(ItemMod),
        Static(ItemStatic),
        Struct(ItemStruct),
        Trait(ItemTrait),
        TraitAlias(ItemTraitAlias),
        Type(ItemType),
        Union(ItemUnion),
        Use(ItemUse),
        Verbatim(TokenStream),
        // some variants omitted
    }

Things that can appear directly inside of a module or scope.

This type is available only if Syn is built with the `"full"` feature.

# Syntax tree enum

This type is a syntax tree enum.

## Variants

`Const(ItemConst)`

A constant item: `const MAX: u16 = 65535`.

`Enum(ItemEnum)`

An enum definition: `enum Foo<A, B> { A(A), B(B) }`.

`ExternCrate(ItemExternCrate)`

An `extern crate` item: `extern crate serde`.

`Fn(ItemFn)`

A free-standing function: `fn process(n: usize) -> Result<()> { ... }`.

`ForeignMod(ItemForeignMod)`

A block of foreign items: `extern "C" { ... }`.

`Impl(ItemImpl)`

An impl block providing trait or associated items: `impl<A> Trait for Data<A> { ... }`.

`Macro(ItemMacro)`

A macro invocation, which includes `macro_rules!` definitions.

`Macro2(ItemMacro2)`

A 2.0-style declarative macro introduced by the `macro` keyword.

`Mod(ItemMod)`

A module or module declaration: `mod m` or `mod m { ... }`.

`Static(ItemStatic)`

A static item: `static BIKE: Shed = Shed(42)`.

`Struct(ItemStruct)`

A struct definition: `struct Foo<A> { x: A }`.

`Trait(ItemTrait)`

A trait definition: `pub trait Iterator { ... }`.

`TraitAlias(ItemTraitAlias)`

A trait alias: `pub trait SharableIterator = Iterator + Sync`.

`Type(ItemType)`

A type alias: `type Result<T> = std::result::Result<T, MyError>`.

`Union(ItemUnion)`

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

`Use(ItemUse)`

A use declaration: `use std::collections::HashMap`.

`Verbatim(TokenStream)`

Tokens forming an item not interpreted by Syn.

## Trait Implementations

### `impl Clone for Item` [src]

#### `fn clone(&self) -> Self` [src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`1.0.0 [src]

Performs copy-assignment from `source`. Read more

### `impl From<DeriveInput> for Item` [src]

#### `fn from(input: DeriveInput) -> Item` [src]

Performs the conversion.

### `impl From<ItemConst> for Item` [src]

#### `fn from(e: ItemConst) -> Item` [src]

Performs the conversion.

### `impl From<ItemEnum> for Item` [src]

#### `fn from(e: ItemEnum) -> Item` [src]

Performs the conversion.

### `impl From<ItemExternCrate> for Item` [src]

#### `fn from(e: ItemExternCrate) -> Item` [src]

Performs the conversion.

### `impl From<ItemFn> for Item` [src]

#### `fn from(e: ItemFn) -> Item` [src]

Performs the conversion.

### `impl From<ItemForeignMod> for Item` [src]

#### `fn from(e: ItemForeignMod) -> Item` [src]

Performs the conversion.

### `impl From<ItemImpl> for Item` [src]

#### `fn from(e: ItemImpl) -> Item` [src]

Performs the conversion.

### `impl From<ItemMacro> for Item` [src]

#### `fn from(e: ItemMacro) -> Item` [src]

Performs the conversion.

### `impl From<ItemMacro2> for Item` [src]

#### `fn from(e: ItemMacro2) -> Item` [src]

Performs the conversion.

### `impl From<ItemMod> for Item` [src]

#### `fn from(e: ItemMod) -> Item` [src]

Performs the conversion.

### `impl From<ItemStatic> for Item` [src]

#### `fn from(e: ItemStatic) -> Item` [src]

Performs the conversion.

### `impl From<ItemStruct> for Item` [src]

#### `fn from(e: ItemStruct) -> Item` [src]

Performs the conversion.

### `impl From<ItemTrait> for Item` [src]

#### `fn from(e: ItemTrait) -> Item` [src]

Performs the conversion.

### `impl From<ItemTraitAlias> for Item` [src]

#### `fn from(e: ItemTraitAlias) -> Item` [src]

Performs the conversion.

### `impl From<ItemType> for Item` [src]

#### `fn from(e: ItemType) -> Item` [src]

Performs the conversion.

### `impl From<ItemUnion> for Item` [src]

#### `fn from(e: ItemUnion) -> Item` [src]

Performs the conversion.

### `impl From<ItemUse> for Item` [src]

#### `fn from(e: ItemUse) -> Item` [src]

Performs the conversion.

### `impl Parse for Item` [src]

#### `fn parse(input: ParseStream<'_>) -> Result<Self>` [src]

### `impl ToTokens for Item` [src]

#### `fn to_tokens(&self, tokens: &mut TokenStream)` [src]

Write `self` to the given `TokenStream`. Read more

#### `fn to_token_stream(&self) -> TokenStream` [src]

Convert `self` directly into a `TokenStream` object. Read more

#### `fn into_token_stream(self) -> TokenStream` [src]

Convert `self` directly into a `TokenStream` object. Read more

## Auto Trait Implementations

### `impl RefUnwindSafe for Item`

### `impl !Send for Item`

### `impl !Sync for Item`

### `impl Unpin for Item`

### `impl UnwindSafe for Item`

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId` [src]

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

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &T` [src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut T` [src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T` [src]

#### `pub fn from(t: T) -> T` [src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U` [src]

Performs the conversion.

### `impl<T> Spanned for T where
T: Spanned + ?Sized,` [src]

#### `pub fn span(&Self) -> Span` [src]

Returns a `Span` covering the complete contents of this syntax tree node, or `Span::call_site()` if this node is empty. Read more

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `pub fn to_owned(&self) -> T` [src]

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

#### `pub fn clone_into(&self, target: &mut T)` [src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into`)

recently added

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

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>` [src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

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

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>` [src]

Performs the conversion.