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.
The type of the elements being iterated over.
Which kind of iterator are we turning this into?
Extends a collection with the contents of an iterator. Read more
Extends a collection with the contents of an iterator. Read more
Converts the given value to a String
. Read more
Creates a token stream containing a single token tree.
Performs copy-assignment from source
. Read more
Prints token in a form convenient for debugging.
Formats the value using the given formatter. Read more
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
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 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 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 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
🔬 This is a nightly-only experimental API. (get_type_id
#27745)
this method will likely be replaced by an associated static
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