[−][src]Enum syntax::ext::tt::quoted::TokenTree
Similar to tokenstream::TokenTree
, except that $i
, $i:ident
, and $(...)
are "first-class" token trees. Useful for parsing macros.
Variants
Token(Span, Token)
Delimited(DelimSpan, Lrc<Delimited>)
Sequence(DelimSpan, Lrc<SequenceRepetition>)
A kleene-style repetition sequence
MetaVar(Span, Ident)
e.g., $var
MetaVarDecl(Span, Ident, Ident)
e.g., $var:expr
. This is only used in the left hand side of MBE macros.
Methods
impl TokenTree
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pub fn len(&self) -> usize
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Return the number of tokens in the tree.
pub fn is_empty(&self) -> bool
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Returns true
if the given token tree contains no other tokens. This is vacuously true for
single tokens or metavar/decls, but may be false for delimited trees or sequences.
pub fn get_tt(&self, index: usize) -> TokenTree
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Gets the index
-th sub-token-tree. This only makes sense for delimited trees and sequences.
pub fn span(&self) -> Span
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Retrieves the TokenTree
's span.
Trait Implementations
impl Clone for TokenTree
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fn clone(&self) -> TokenTree
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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl PartialEq<TokenTree> for TokenTree
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impl Debug for TokenTree
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impl Encodable for TokenTree
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impl Decodable for TokenTree
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Auto Trait Implementations
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Encodable for T where
T: UseSpecializedEncodable + ?Sized,
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T: UseSpecializedEncodable + ?Sized,
impl<T> Decodable for T where
T: UseSpecializedDecodable,
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T: UseSpecializedDecodable,
impl<E> SpecializationError for E
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default fn not_found<S, T>(
trait_name: &'static str,
method_name: &'static str
) -> E where
T: ?Sized,
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trait_name: &'static str,
method_name: &'static str
) -> E where
T: ?Sized,
impl<T> Send for T where
T: ?Sized,
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T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
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T: ?Sized,