Method checkpoint

crates/ruff_python_parser/src/token_source.rs:194–199

Creates a checkpoint to which the token source can later return to using [`Self::rewind`].

(&self)

    /// Creates a checkpoint to which the token source can later return to using [`Self::rewind`].
    pub(crate) fn checkpoint(&self) -> TokenSourceCheckpoint {
        TokenSourceCheckpoint {
            lexer_checkpoint: self.lexer.checkpoint(),
            tokens_position: self.tokens.len(),
        }
    }

    /// Restore the token source to the given checkpoint.
    pub(crate) fn rewind(&mut self, checkpoint: TokenSourceCheckpoint) {