[][src]Enum rustc_ast::tokenstream::TokenTree

pub enum TokenTree {
    Token(Token),
    Delimited(DelimSpanDelimTokenTokenStream),
}

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

Token(Token)

A single token

Delimited(DelimSpanDelimTokenTokenStream)

A delimited sequence of token trees

Implementations

impl TokenTree[src]

pub fn eq_unspanned(&self, other: &TokenTree) -> bool[src]

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

pub fn span(&self) -> Span[src]

Retrieves the TokenTree's span.

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

Modify the TokenTree's span in-place.

pub fn joint(self) -> TokenStream[src]

pub fn token(kind: TokenKind, span: Span) -> TokenTree[src]

pub fn open_tt(span: DelimSpan, delim: DelimToken) -> TokenTree[src]

Returns the opening delimiter as a token tree.

pub fn close_tt(span: DelimSpan, delim: DelimToken) -> TokenTree[src]

Returns the closing delimiter as a token tree.

pub fn uninterpolate(self) -> TokenTree[src]

Trait Implementations

impl Clone for TokenTree[src]

impl Debug for TokenTree[src]

impl Decodable for TokenTree[src]

impl Encodable for TokenTree[src]

impl From<TokenTree> for TokenStream[src]

impl From<TokenTree> for TreeAndJoint[src]

impl FromIterator<TokenTree> for TokenStream[src]

impl<__CTX> HashStable<__CTX> for TokenTree where
    __CTX: HashStableContext
[src]

impl PartialEq<TokenTree> for TokenTree[src]

impl StructuralPartialEq for TokenTree[src]

Auto Trait Implementations

impl !RefUnwindSafe for TokenTree

impl !Send for TokenTree

impl !Sync for TokenTree

impl Unpin for TokenTree

impl !UnwindSafe for TokenTree

Blanket Implementations

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

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

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

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

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

impl<T> From<T> for T[src]

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

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

type Owned = T

The resulting type after obtaining ownership.

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

type Error = Infallible

The type returned in the event of a conversion error.

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

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.