1 files changed, 3 insertions, 0 deletions
diff --git a/include/error.h b/include/error.h
index d8be4e5..d058ec4 100644
--- a/include/error.h
+++ b/include/error.h
@@ -17,6 +17,9 @@ enum class error_code
     AST_EXIST_LEFT_CHILLD,
     AST_EXIST_RIGHT_CHILD,
 
+    // eval
+    EVAL_FAIL_TO_CREATE_PIPE,
+
 };
 
 class T_error : public std::runtime_error {