Refactoring for immutable nodes

Src/AST/Myc.Ast.Nodes.pas

@@ -132,6 +132,7 @@ type
     IAstNode = interface(IInterface)
         {$region 'private'}
         function GetKind: TAstNodeKind;
+        function GetIsTyped: Boolean;
         {$endregion}
         function Accept(const Visitor: IAstVisitor): TDataValue;
 
@@ -164,6 +165,7 @@ type
         function AsBoundIdentifierNode: IBoundIdentifierNode;
         function AsTypedNode: IAstTypedNode;
 
+        property IsTyped: Boolean read GetIsTyped;
         property Kind: TAstNodeKind read GetKind;
     end;