jcos1

You need to consume/advance the left parenthese (the match only peeks at it). In parser.rs add `self.consume(TokenType::LeftParen, "Expected '(' before expression.")?;` or maybe just advance? [in fn primary](https://github.com/jeschkies/lox-rs/blob/9508c9d887a88540597d314520ae6aa045256e7d/src/parser.rs#L204-L210) This still...

At the moment, I modified [consume](https://github.com/jeschkies/lox-rs/blob/9508c9d887a88540597d314520ae6aa045256e7d/src/parser.rs#L63) to use peek instead of advance. That makes the check for the closing `)` work again.