Enum `Spacing`

pub enum Spacing

Indicates whether a Punct token can join with the following token to form a multi-character operator.

Variants

Joint

A Punct token can join with the following token to form a multi-character operator.

In token streams constructed using proc macro interfaces, Joint punctuation tokens can be followed by any other tokens. However, in token streams parsed from source code, the compiler will only set spacing to Joint in the following cases.

When a Punct is immediately followed by another Punct without a whitespace. E.g. + is Joint in += and ++.
When a single quote ' is immediately followed by an identifier without a whitespace. E.g. ' is Joint in 'lifetime.

This list may be extended in the future to enable more token combinations.

Alone

A Punct token cannot join with the following token to form a multi-character operator.

Alone punctuation tokens can be followed by any other tokens. In token streams parsed from source code, the compiler will set spacing to Alone in all cases not covered by the conditions for Joint above. E.g. + is Alone in + =, +ident and +(). In particular, tokens not followed by anything will be marked as Alone.

Trait Implementations

`impl Clone for Spacing`

fn clone(&self) -> Spacing

`impl Copy for Spacing`

`impl Debug for Spacing`

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

`impl Eq for Spacing`

fn assert_fields_are_eq(&self)

`impl PartialEq for Spacing`

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

`impl StructuralPartialEq for Spacing`

`impl TrivialClone for Spacing`

Auto Trait Implementations

`impl Freeze for Spacing`

`impl RefUnwindSafe for Spacing`

`impl Send for Spacing`

`impl Sync for Spacing`

`impl Unpin for Spacing`

`impl UnsafeUnpin for Spacing`

`impl UnwindSafe for Spacing`

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

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

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

`impl<T> From<T> for Spacing`

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

`impl<T> Printable for Spacing where T: Copy + Debug,`

`impl<T> SizeHint for Spacing where T: ?Sized,`

fn lower_bound(&self) -> usize
fn upper_bound(&self) -> Option<usize>

`impl<T> SizedTypeProperties for Spacing`

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

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

`impl<T, U> Into for Spacing 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 Spacing where U: Into<T>,`

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

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

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