Enum TokenTree

pub enum TokenTree {
    Group(Group),
    Ident(Ident),
    Punct(Punct),
    Literal(Literal),
}

A single token or a delimited sequence of token trees (e.g. [1, (), ..]).

Variants

Group(Group)

A token stream surrounded by bracket delimiters.

Ident(Ident)

An identifier.

Punct(Punct)

A single punctuation character (+, ,, $, etc.).

Literal(Literal)

A literal character ('a'), string ("hello"), number (2.3), etc.

Implementations

impl TokenTree

pub fn span(&self) -> Span

Returns the span of this tree, delegating to the span method of the contained token or a delimited stream.

pub fn set_span(&mut self, span: Span)

Configures the span for only this token.

Note that if this token is a Group then this method will not configure the span of each of the internal tokens, this will simply delegate to the set_span method of each variant.

Trait Implementations

impl Clone for TokenTree

fn clone(&self) -> TokenTree

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TokenTree

Prints token tree in a form convenient for debugging.

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

Formats the value using the given formatter.

impl Display for TokenTree

Prints the token tree as a string that is supposed to be losslessly convertible back into the same token tree (modulo spans), except for possibly TokenTree::Groups with Delimiter::None delimiters and negative numeric literals.

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

Formats the value using the given formatter.

impl Extend<TokenTree> for TokenStream

fn extend<I: IntoIterator<Item = TokenTree>>(&mut self, streams: I)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

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

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

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

Reserves capacity in a collection for the given number of additional elements.

impl From<Group> for TokenTree

fn from(g: Group) -> Self

Converts to this type from the input type.

impl From<Ident> for TokenTree

fn from(g: Ident) -> Self

Converts to this type from the input type.

impl From<Literal> for TokenTree

fn from(g: Literal) -> Self

Converts to this type from the input type.

impl From<Punct> for TokenTree

fn from(g: Punct) -> Self

Converts to this type from the input type.

impl From<TokenTree> for TokenStream

fn from(token: TokenTree) -> Self

Converts to this type from the input type.

impl FromIterator<TokenTree> for TokenStream

Collects a number of token trees into a single stream.

fn from_iter<I: IntoIterator<Item = TokenTree>>(streams: I) -> Self

Creates a value from an iterator.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 32 bytes

Size for each variant:

• Group: 28 bytes
• Ident: 28 bytes
• Punct: 12 bytes
• Literal: 28 bytes