Method checkpoint

crates/ruff_python_parser/src/parser/mod.rs:867–876

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

(&self)

    /// Creates a checkpoint to which the parser can later return to using [`Self::rewind`].
    fn checkpoint(&self) -> ParserCheckpoint {
        ParserCheckpoint {
            tokens: self.tokens.checkpoint(),
            errors_position: self.errors.len(),
            unsupported_syntax_errors_position: self.unsupported_syntax_errors.len(),
            current_token_id: self.current_token_id,
            prev_token_end: self.prev_token_end,
            recovery_context: self.recovery_context,
        }
    }

    /// Restore the parser to the given checkpoint.
    fn rewind(&mut self, checkpoint: ParserCheckpoint) {