added support for `cons`, `car`, `cdr`

1 files changed, 2 insertions, 1 deletions

diff --git a/consts.h b/consts.h
index 5e3f43d..5991317 100644
--- a/consts.h
+++ b/consts.h
@@ -9,7 +9,8 @@ enum ErrCode {
     SYN_ERR_EMPTY_PARA_LIST,
     RUN_ERR_WRONG_NUM_OF_ARGS,
     SYN_ERR_EMPTY_COMB,
-    READ_ERR_UNEXPECTED_RIGHT_BRACKET
+    READ_ERR_UNEXPECTED_RIGHT_BRACKET,
+    RUN_ERR_WRONG_TYPE
 };
 
 extern const char *SYN_ERR_MSG[];