pub enum TokenTree {
Token(Span, Token),
Delimited(DelimSpan, Lrc<Delimited>),
Sequence(DelimSpan, Lrc<SequenceRepetition>),
MetaVar(Span, Ident),
MetaVarDecl(Span, Ident, Ident),
}
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Similar to tokenstream::TokenTree
, except that $i
, $i:ident
, and $(...)
are "first-class" token trees. Useful for parsing macros.
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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:expr
. This is only used in the left hand side of MBE macros.
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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.
Formats the value using the given formatter. Read more
Performs copy-assignment from source
. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
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Creates owned data from borrowed data, usually by cloning. Read more
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)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
🔬 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
)
Immutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
🔬 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
)
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static
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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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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