Test gen order of operations arithmetic

tests/test_gen.rs

@@ -651,6 +651,19 @@ mod test_gen {
         );
     }
 
+    #[test]
+    fn gen_order_of_arithmetic_ops() {
+        assert_evals_to!(
+            indoc!(
+                r#"
+                    1 + 3 * 7 - 2
+                "#
+            ),
+            20,
+            i64
+        );
+    }
+
     #[test]
     fn return_unnamed_fn() {
         assert_evals_to!(