Method parse_fn_expr

src/parser.rs:459–471

(&mut self)

    }

    fn parse_fn_expr(&mut self) -> Option<Expr> {
        if !self.expect_peek(Token::LeftParen) {
            return None;
        }
        let params = match self.parse_params() {
            Some(s) => s,
            None => return None,
        };
        self.next_token();
        let body = self.parse_block_statement();
        
        Some(Expr::Fun { params, body })
    }

    fn token_to_precedence(tok: &Token) -> Precedence {
        match tok {