pub struct TokenStream(_);
The main type provided by this crate, representing an abstract stream of tokens, or, more specifically, a sequence of token trees. The type provide interfaces for iterating over those token trees and, conversely, collecting a number of token trees into one stream.
This is both the input and output of
Returns an empty
TokenStream containing no token trees.
Checks if this
TokenStream is empty.
🔬This is a nightly-only experimental API. (
TokenStream as an expression and attempts to expand any
macros within it. Returns the expanded
Currently only expressions expanding to literals will succeed, although this may be relaxed in the future.
NOTE: In error conditions,
expand_expr may leave macros unexpanded,
report an error, failing compilation, and/or return an
specific behavior for any error condition, and what conditions are
considered errors, is unspecified and may change in the future.
Prints token in a form convenient for debugging.
Prints the token stream as a string that is supposed to be losslessly convertible back
into the same token stream (modulo spans), except for possibly
Delimiter::None delimiters and negative numeric literals.
Creates a token stream containing a single token tree.
A “flattening” operation on token streams, collects token trees from multiple token streams into a single stream.
Collects a number of token trees into a single stream.
Attempts to break the string into tokens and parse those tokens into a token stream.
May fail for a number of reasons, for example, if the string contains unbalanced delimiters
or characters not existing in the language.
All tokens in the parsed stream get
NOTE: some errors may cause panics instead of returning
LexError. We reserve the right to
change these errors into
sto return a value of this type. Read more
Returns the argument unchanged.