[][src]Enum syntax::tokenstream::TokenTree

pub enum TokenTree {
    Token(SpanToken),
    Delimited(DelimSpanDelimited),
}
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When the main rust parser encounters a syntax-extension invocation, it parses the arguments to the invocation as a token-tree. This is a very loose structure, such that all sorts of different AST-fragments can be passed to syntax extensions using a uniform type.

If the syntax extension is an MBE macro, it will attempt to match its LHS token tree against the provided token tree, and if it finds a match, will transcribe the RHS token tree, splicing in any captured macro_parser::matched_nonterminals into the SubstNts it finds.

The RHS of an MBE macro is the only place SubstNts are substituted. Nothing special happens to misnamed or misplaced SubstNts.

Variants

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A single token

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A delimited sequence of token trees

Methods

impl TokenTree
[src]

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Use this token tree as a matcher to parse given tts.

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Check if this TokenTree is equal to the other, regardless of span information.

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Retrieve the TokenTree's span.

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Modify the TokenTree's span inplace.

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Indicates if the stream is a token that is equal to the provided token.

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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]

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impl Decodable for TokenTree
[src]

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impl From<TokenTree> for TokenStream
[src]

Performs the conversion.

impl ToTokens for TokenTree
[src]

Important traits for Vec<u8>

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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]

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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
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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
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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
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impl<T> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> Erased for T