1 files changed, 12 insertions, 0 deletions
diff --git a/libalee/types.hpp b/libalee/types.hpp
index 5b577f2..0a7f7ee 100644
--- a/libalee/types.hpp
+++ b/libalee/types.hpp
@@ -32,6 +32,18 @@ using Func = void (*)(State&);
 
 constexpr unsigned int MaxCellNumberChars = 6; // -32768
 
+enum class Error : int {
+    none = 0,
+    push,
+    pop,
+    pushr,
+    popr,
+    top,
+    pick,
+    exit,
+    noword
+};
+
 struct Word
 {
     struct iterator;