Clean up many strdups

test/test_e2e.c

@@ -103,6 +103,12 @@ static void test_eval_sym_undefined(void) {
     TEST_ASSERT_OBJ_ERROR(response);
 }
 
+static void test_eval_nested_error(void) {
+    response = eval("(+ (error \"foo\") 3)");
+    TEST_ASSERT_OBJ_ERROR(response);
+}
+
+
 int main(void) {
     UNITY_BEGIN();
 
@@ -117,6 +123,7 @@ int main(void) {
     RUN_TEST(test_eval_string);
     RUN_TEST(test_eval_sym_defined);
     RUN_TEST(test_eval_sym_undefined);
+    RUN_TEST(test_eval_nested_error);
 
     return UNITY_END();
 }