diff --git a/lib/include/artichoke/Parser/AST/Common.hpp b/lib/include/artichoke/Parser/AST/Common.hpp
index 107cdd7..740ba63 100644
--- a/lib/include/artichoke/Parser/AST/Common.hpp
+++ b/lib/include/artichoke/Parser/AST/Common.hpp
@@ -15,11 +15,13 @@ namespace arti::lang::ast {
   };
 
   enum class Mutability {
+    Uninitialized,
     Mutable,
     Constant,
   };
 
   enum class TypeQualifier {
+    Uninitialized,
     Pointer,
     Slice,
     Mutable,
@@ -27,6 +29,7 @@ namespace arti::lang::ast {
   };
 
   enum class UnaryOperator {
+    Uninitialized,
     Not,
     Minus,
     BitNot,
@@ -35,15 +38,29 @@ namespace arti::lang::ast {
   };
 
   enum class BinaryOperator {
+    Uninitialized,
     Equal,
     NotEqual,
     GreaterThan,
     LessThan,
     GreaterEqual,
     LessEqual,
+    BitAnd,
+    BitXor,
+    BitOr,
+    LeftShift,
+    RightShift,
+    Adition,
+    Substraction,
+    Multiplication,
+    Division,
+    Modulo,
+    BoolAnd,
+    BoolOr,
   };
 
   enum class CompoundAssignOperator {
+    Uninitialized,
     Addition,
     Substraction,
     Multiplication,