Enum syn::Item

source · [−]

#[non_exhaustive]
pub enum Item {
Show 17 variants
    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),
}

Expand description

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 (Non-exhaustive)

This enum is marked as 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.

`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 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<ItemMacro2> for Item

fn from(e: ItemMacro2) -> 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 Parse for Item

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

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,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · 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, U> TryFrom<U> for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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.

const: unstable · source

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

Performs the conversion.