xo-interpreter2 stack: refactor + bugfix operator expr

include/xo/facet/FacetRegistry.hpp

@@ -9,7 +9,6 @@
 
 #include "TypeRegistry.hpp"
 #include "facet_implementation.hpp"
-//#include "typeseq.hpp"
 #include "obj.hpp"
 #include <xo/arena/DArenaHashMap.hpp>
 #include <xo/indentlog/scope.hpp>

include/xo/facet/OObject.hpp

@@ -273,7 +273,7 @@ namespace xo {
              *
              * Deliberately disable this for variants
              **/
-            DRepr * operator->()
+            DRepr * operator->() const noexcept
             requires (!std::is_same_v<DataType, DVariantPlaceholder>)
             { return data_; }