feat(tazjin/rlox): Parse function calls

Change-Id: I1836c73dbfd5fc4ca30c2d22bbffee2fb222d566
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2366
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI

users/tazjin/rlox/src/interpreter.rs

@@ -190,6 +190,7 @@ impl Interpreter {
             Expr::Binary(binary) => self.eval_binary(binary),
             Expr::Variable(var) => self.get_var(var),
             Expr::Logical(log) => self.eval_logical(log),
+            Expr::Call(_) => unimplemented!(),
         }
     }