You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: expression.rs
    path of file: ./repos/surrealdb/core/src/syn/v2/parser
    
    the code of the file until where you have to start completion: //! This module defines the pratt parser for operators.

use super::mac::unexpected;
use
    
	pub fn parse_assigner(&mut self) -> ParseResult<Operator> {
		match self.next().kind {
			t!("=") => Ok(Operator::Equal),
			t!("+=") => Ok(Operator::Inc),
			t!("-=") => Ok(Operator::Dec),
			t!("+?=") => Ok(Operator::Ext),
			x => unexpected!(self, x, "an assign operator"),
		}
	}