[][src]Enum syntax::ext::tt::quoted::TokenTree

pub enum TokenTree {
    Token(SpanToken),
    Delimited(DelimSpanLrc<Delimited>),
    Sequence(DelimSpanLrc<SequenceRepetition>),
    MetaVar(SpanIdent),
    MetaVarDecl(SpanIdentIdent),
}
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Similar to tokenstream::TokenTree, except that $i, $i:ident, and $(...) are "first-class" token trees. Useful for parsing macros.

Variants

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

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

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A kleene-style repetition sequence

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E.g. $var

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E.g. $var:expr. This is only used in the left hand side of MBE macros.

Methods

impl TokenTree
[src]

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Return the number of tokens in the tree.

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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.

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Get the index-th sub-token-tree. This only makes sense for delimited trees and sequences.

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Retrieve the TokenTree's span.

Trait Implementations

impl Debug for TokenTree
[src]

Formats the value using the given formatter. Read more

impl Clone for TokenTree
[src]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl PartialEq for TokenTree
[src]

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl Encodable for TokenTree
[src]

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

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impl Decodable for TokenTree
[src]

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Auto Trait Implementations

impl !Send for TokenTree

impl !Sync for TokenTree

Blanket Implementations

impl<T> ToOwned for T where
    T: Clone
[src]

Creates owned data from borrowed data, usually by cloning. Read more

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

recently added

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

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

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

The type returned in the event of a conversion error.

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

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.

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

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
[src]

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

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<T> Encodable for T where
    T: UseSpecializedEncodable + ?Sized
[src]

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impl<T> Decodable for T where
    T: UseSpecializedDecodable
[src]

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impl<E> SpecializationError for E
[src]

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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
[src]

impl<T> Erased for T