xo-interpreter2 stack: + dict.make() + Dictionary impl

src/object2/DArray.cpp

@@ -67,6 +67,19 @@ namespace xo {
             }
         }
 
+        bool
+        DArray::assign_at(size_type ix, obj<AGCObject> x) noexcept
+        {
+            if (ix >= size_)
+                return false;
+
+            scope log(XO_DEBUG(true), "need write barrier");
+
+            this->elts_[ix] = x;
+
+            return true;
+        }
+
         bool
         DArray::push_back(obj<AGCObject> elt) noexcept
         {