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> = core::result::Result<T, MyError>.

Union(ItemUnion)

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

Use(ItemUse)

A use declaration: use alloc::collections::HashMap.

Verbatim(TokenStream)

Tokens forming an item not interpreted by Syn.

Important: see [Compatibility notes][crate#verbatim-variants].