Enum syn::ReturnType

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pub enum ReturnType {
    Default,
    Type(RArrow, Box<Type>),
}

Expand description

Return type of a function signature.

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

Variants

`Default`

Return type is not specified.

Functions default to () and closures default to type inference.

`Type(RArrow, Box<Type>)`

A particular type is returned.

Implementations

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impl ReturnType

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

Trait Implementations

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impl Clone for ReturnType

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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

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impl Debug for ReturnType

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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 Hash for ReturnType

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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

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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 ==. Read more

1.0.0 · source

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

This method tests for !=.

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impl ToTokens for ReturnType

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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

Convert self directly into a TokenStream object. Read more

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impl Eq for ReturnType

Auto Trait Implementations

impl RefUnwindSafe for ReturnType

impl !Send for ReturnType

impl !Sync for ReturnType

impl Unpin for ReturnType

impl UnwindSafe for ReturnType

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,

const: unstable · source

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,

const: unstable · source

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

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into 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.

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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. Read more

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impl<T> ToOwned for T where
T: Clone,

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)

🔬 This is a nightly-only experimental API. (toowned_clone_into)

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

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impl<T, U> TryFrom 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>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

Enum syn::ReturnType

Variants

Default

Type(RArrow, Box<Type>)

Implementations

impl ReturnType

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

Trait Implementations

impl Clone for ReturnType

fn clone(&self) -> Self

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

impl Debug for ReturnType

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

impl Hash for ReturnType

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

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

impl Parse for ReturnType

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

impl PartialEq<ReturnType> for ReturnType

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

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

impl ToTokens for ReturnType

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

fn to_token_stream(&self) -> TokenStream

fn into_token_stream(self) -> TokenStream

impl Eq for ReturnType

Auto Trait Implementations

impl RefUnwindSafe for ReturnType

impl !Send for ReturnType

impl !Sync for ReturnType

impl Unpin for ReturnType

impl UnwindSafe for ReturnType

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

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

fn span(&self) -> Span

impl<T> ToOwned for T where T: Clone,

type Owned = T

fn to_owned(&self) -> T

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

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

type Error = Infallible

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

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

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

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

`Default`

`Type(RArrow, Box<Type>)`

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

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

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

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

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

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

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

impl<T> ToOwned for T where
T: Clone,

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

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,