Enum Item

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

Available on crate feature full only.

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

Syntax tree enum

This type is a syntax tree enum.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future 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.

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

Available on crate feature clone-impls only.

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Item

Available on crate feature extra-traits only.

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

Formats the value using the given formatter.

impl From<DeriveInput> for Item

fn from(input: DeriveInput) -> Item

Converts to this type from the input type.

impl From<ItemConst> for Item

fn from(e: ItemConst) -> Item

Converts to this type from the input type.

impl From<ItemEnum> for Item

fn from(e: ItemEnum) -> Item

Converts to this type from the input type.

impl From<ItemExternCrate> for Item

fn from(e: ItemExternCrate) -> Item

Converts to this type from the input type.

impl From<ItemFn> for Item

fn from(e: ItemFn) -> Item

Converts to this type from the input type.

impl From<ItemForeignMod> for Item

fn from(e: ItemForeignMod) -> Item

Converts to this type from the input type.

impl From<ItemImpl> for Item

fn from(e: ItemImpl) -> Item

Converts to this type from the input type.

impl From<ItemMacro> for Item

fn from(e: ItemMacro) -> Item

Converts to this type from the input type.

impl From<ItemMod> for Item

fn from(e: ItemMod) -> Item

Converts to this type from the input type.

impl From<ItemStatic> for Item

fn from(e: ItemStatic) -> Item

Converts to this type from the input type.

impl From<ItemStruct> for Item

fn from(e: ItemStruct) -> Item

Converts to this type from the input type.

impl From<ItemTrait> for Item

fn from(e: ItemTrait) -> Item

Converts to this type from the input type.

impl From<ItemTraitAlias> for Item

fn from(e: ItemTraitAlias) -> Item

Converts to this type from the input type.

impl From<ItemType> for Item

fn from(e: ItemType) -> Item

Converts to this type from the input type.

impl From<ItemUnion> for Item

fn from(e: ItemUnion) -> Item

Converts to this type from the input type.

impl From<ItemUse> for Item

fn from(e: ItemUse) -> Item

Converts to this type from the input type.

impl Hash for Item

Available on crate feature extra-traits only.

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Parse for Item

Available on crate feature parsing only.

fn parse(input: ParseStream<'_>) -> Result<Self>

impl PartialEq for Item

Available on crate feature extra-traits only.

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ToTokens for Item

Available on crate feature printing only.

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.

impl Eq for Item

Available on crate feature extra-traits only.

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: 352 bytes

Size for each variant:

• Const: 208 bytes
• Enum: 224 bytes
• ExternCrate: 136 bytes
• Fn: 352 bytes
• ForeignMod: 96 bytes
• Impl: 248 bytes
• Macro: 168 bytes
• Mod: 152 bytes
• Static: 128 bytes
• Struct: 248 bytes
• Trait: 272 bytes
• TraitAlias: 224 bytes
• Type: 200 bytes
• Union: 232 bytes
• Use: 152 bytes
• Verbatim: 40 bytes