Enum syn::Type

source · [−]

#[non_exhaustive]
pub enum Type {
Show 15 variants
    Array(TypeArray),
    BareFn(TypeBareFn),
    Group(TypeGroup),
    ImplTrait(TypeImplTrait),
    Infer(TypeInfer),
    Macro(TypeMacro),
    Never(TypeNever),
    Paren(TypeParen),
    Path(TypePath),
    Ptr(TypePtr),
    Reference(TypeReference),
    Slice(TypeSlice),
    TraitObject(TypeTraitObject),
    Tuple(TypeTuple),
    Verbatim(TokenStream),
}

Available on crate features full or derive only.

Expand description

The possible types that a Rust value could have.

This type is available only if Syn is built with the "derive" or "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.

`Array(TypeArray)`

A fixed size array type: [T; n].

`BareFn(TypeBareFn)`

A bare function type: fn(usize) -> bool.

`Group(TypeGroup)`

A type contained within invisible delimiters.

`ImplTrait(TypeImplTrait)`

An impl Bound1 + Bound2 + Bound3 type where Bound is a trait or a lifetime.

`Infer(TypeInfer)`

Indication that a type should be inferred by the compiler: _.

`Macro(TypeMacro)`

A macro in the type position.

`Never(TypeNever)`

The never type: !.

`Paren(TypeParen)`

A parenthesized type equivalent to the inner type.

`Path(TypePath)`

A path like std::slice::Iter, optionally qualified with a self-type as in <Vec<T> as SomeTrait>::Associated.

`Ptr(TypePtr)`

A raw pointer type: *const T or *mut T.

`Reference(TypeReference)`

A reference type: &'a T or &'a mut T.

`Slice(TypeSlice)`

A dynamically sized slice type: [T].

`TraitObject(TypeTraitObject)`

A trait object type dyn Bound1 + Bound2 + Bound3 where Bound is a trait or a lifetime.

`Tuple(TypeTuple)`

A tuple type: (A, B, C, String).

`Verbatim(TokenStream)`

Tokens in type position not interpreted by Syn.

Implementations

impl Type

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

Available on crate feature parsing only.

In some positions, types may not contain the + character, to disambiguate them. For example in the expression 1 as T, T may not contain a + character.

This parser does not allow a +, while the default parser does.

Trait Implementations

impl Clone for Type

Available on crate feature clone-impls only.

fn clone(&self) -> Self

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

impl Debug for Type

Available on crate feature extra-traits only.

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

Formats the value using the given formatter. Read more

impl From<TypeArray> for Type

fn from(e: TypeArray) -> Type

Converts to this type from the input type.

impl From<TypeBareFn> for Type

fn from(e: TypeBareFn) -> Type

Converts to this type from the input type.

impl From<TypeGroup> for Type

fn from(e: TypeGroup) -> Type

Converts to this type from the input type.

impl From<TypeImplTrait> for Type

fn from(e: TypeImplTrait) -> Type

Converts to this type from the input type.

impl From<TypeInfer> for Type

fn from(e: TypeInfer) -> Type

Converts to this type from the input type.

impl From<TypeMacro> for Type

fn from(e: TypeMacro) -> Type

Converts to this type from the input type.

impl From<TypeNever> for Type

fn from(e: TypeNever) -> Type

Converts to this type from the input type.

impl From<TypeParen> for Type

fn from(e: TypeParen) -> Type

Converts to this type from the input type.

impl From<TypePath> for Type

fn from(e: TypePath) -> Type

Converts to this type from the input type.

impl From<TypePtr> for Type

fn from(e: TypePtr) -> Type

Converts to this type from the input type.

impl From<TypeReference> for Type

fn from(e: TypeReference) -> Type

Converts to this type from the input type.

impl From<TypeSlice> for Type

fn from(e: TypeSlice) -> Type

Converts to this type from the input type.

impl From<TypeTraitObject> for Type

fn from(e: TypeTraitObject) -> Type

Converts to this type from the input type.

impl From<TypeTuple> for Type

fn from(e: TypeTuple) -> Type

Converts to this type from the input type.

impl Hash for Type

Available on crate feature extra-traits only.

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

Feeds this value into the given Hasher. Read more

1.3.0 · source

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

Feeds a slice of this type into the given Hasher. Read more

impl Parse for Type

Available on crate feature parsing only.

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

impl PartialEq<Type> for Type

Available on crate feature extra-traits only.

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

This method tests for self and other values to be equal, and is used by ==. Read more

1.0.0 · source

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

This method tests for !=.

impl ToTokens for Type

Available on crate feature printing only.

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

Write self to the given TokenStream. Read more

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object. Read more

fn into_token_stream(self) -> TokenStream

Convert self directly into a TokenStream object. Read more

impl Eq for Type

Available on crate feature extra-traits only.

Auto Trait Implementations

impl RefUnwindSafe for Type

impl !Send for Type

impl !Sync for Type

impl Unpin for Type

impl UnwindSafe for Type

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> Spanned for T where
T: Spanned + ?Sized,

fn span(&self) -> Span

Available on crate features parsing and printing only.

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,

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

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

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

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

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.