Enum `ReturnType`

pub enum ReturnType

Return type of a function signature.

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

`impl ReturnType`

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

Trait Implementations

`impl Clone for ReturnType`

fn clone(&self) -> Self

`impl Parse for ReturnType`

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

`impl ToTokens for ReturnType`

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

Auto Trait Implementations

`impl !Send for ReturnType`

`impl !Sync for ReturnType`

`impl Freeze for ReturnType`

`impl RefUnwindSafe for ReturnType`

`impl Unpin for ReturnType`

`impl UnsafeUnpin for ReturnType`

`impl UnwindSafe for ReturnType`

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

`impl<T> CloneToUninit for ReturnType where T: Clone,`

unsafe fn clone_to_uninit(&self, dest: *mut u8)

`impl<T> From<T> for ReturnType`

fn from(t: T) -> T: Returns the argument unchanged.

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

fn span(&self) -> Span

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

type Owned = T;
fn to_owned(&self) -> T
fn clone_into(&self, target: &mut T)

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

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 for ReturnType where U: Into<T>,`

type Error = never;
fn try_from(value: U) -> Result<T, never>

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

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