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 #[proc_macro]
, #[proc_macro_attribute]
and #[proc_macro_derive]
definitions.
Returns an empty TokenStream
containing no token trees.
Checks if this TokenStream
is empty.
Converts the given value to a String
. Read more
Performs copy-assignment from source
. Read more
Extends a collection with the contents of an iterator. Read more
Extends a collection with the contents of an iterator. Read more
Creates a token stream containing a single token tree.
The type of the elements being iterated over.
Which kind of iterator are we turning this into?
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 TokenTree::Group
s
with Delimiter::None
delimiters and negative numeric literals.
Formats the value using the given formatter. Read more
Prints token in a form convenient for debugging.
Formats the value using the given formatter. Read more
Collects a number of token trees into a single stream.
A "flattening" operation on token streams, collects token trees
from multiple token streams 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 Span::call_site()
spans.
NOTE: Some errors may cause panics instead of returning LexError
. We reserve the right to
change these errors into LexError
s later.
type Err = LexError
The associated error which can be returned from parsing.
Parses a string s
to return a value of this type. Read more
type Owned = T
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (toowned_clone_into
#41263)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String
. Read more
type Item = <I as Iterator>::Item
The type of the elements being iterated over.
type IntoIter = I
Which kind of iterator are we turning this into?
type Error = !
🔬 This is a nightly-only experimental API. (
try_from
#33417)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (
try_from
#33417)
Immutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
🔬 This is a nightly-only experimental API. (
try_from
#33417)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (
try_from
#33417)
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (get_type_id
#27745)
this method will likely be replaced by an associated static