Enum syn::Type

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#[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),
}
Expand description

The possible types that a Rust value could have.

§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.
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Array(TypeArray)

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

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BareFn(TypeBareFn)

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

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Group(TypeGroup)

A type contained within invisible delimiters.

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ImplTrait(TypeImplTrait)

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

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Infer(TypeInfer)

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

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Macro(TypeMacro)

A macro in the type position.

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Never(TypeNever)

The never type: !.

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Paren(TypeParen)

A parenthesized type equivalent to the inner type.

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Path(TypePath)

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

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Ptr(TypePtr)

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

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Reference(TypeReference)

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

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Slice(TypeSlice)

A dynamically sized slice type: [T].

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TraitObject(TypeTraitObject)

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

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Tuple(TypeTuple)

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

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Verbatim(TokenStream)

Tokens in type position not interpreted by Syn.

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impl Type

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

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§

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impl Clone for Type

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Type

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

Formats the value using the given formatter. Read more
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impl From<TypeArray> for Type

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fn from(e: TypeArray) -> Type

Converts to this type from the input type.
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impl From<TypeBareFn> for Type

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fn from(e: TypeBareFn) -> Type

Converts to this type from the input type.
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impl From<TypeGroup> for Type

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fn from(e: TypeGroup) -> Type

Converts to this type from the input type.
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impl From<TypeImplTrait> for Type

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fn from(e: TypeImplTrait) -> Type

Converts to this type from the input type.
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impl From<TypeInfer> for Type

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fn from(e: TypeInfer) -> Type

Converts to this type from the input type.
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impl From<TypeMacro> for Type

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fn from(e: TypeMacro) -> Type

Converts to this type from the input type.
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impl From<TypeNever> for Type

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fn from(e: TypeNever) -> Type

Converts to this type from the input type.
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impl From<TypeParen> for Type

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fn from(e: TypeParen) -> Type

Converts to this type from the input type.
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impl From<TypePath> for Type

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fn from(e: TypePath) -> Type

Converts to this type from the input type.
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impl From<TypePtr> for Type

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fn from(e: TypePtr) -> Type

Converts to this type from the input type.
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impl From<TypeReference> for Type

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fn from(e: TypeReference) -> Type

Converts to this type from the input type.
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impl From<TypeSlice> for Type

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fn from(e: TypeSlice) -> Type

Converts to this type from the input type.
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impl From<TypeTraitObject> for Type

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fn from(e: TypeTraitObject) -> Type

Converts to this type from the input type.
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impl From<TypeTuple> for Type

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fn from(e: TypeTuple) -> Type

Converts to this type from the input type.
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impl Hash for Type

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Parse for Type

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

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impl PartialEq for Type

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl ToTokens for Type

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

Write self to the given TokenStream. Read more
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fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object. Read more
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fn into_token_stream(self) -> TokenStream
where Self: Sized,

Convert self directly into a TokenStream object. Read more
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impl Eq for Type

Auto Trait Implementations§

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impl RefUnwindSafe for Type

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impl !Send for Type

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impl !Sync for Type

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impl Unpin for Type

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impl UnwindSafe for Type

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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

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fn span(&self) -> Span

Returns a Span covering the complete contents of this syntax tree node, or Span::call_site() if this node is empty.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.