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@@ -184,6 +184,9 @@ sufficient information, see the ChangeLog file or Redmine
 * Method reference operator, <code>.:</code> is introduced as an
   experimental feature.  [Feature #12125] [Feature #13581]
 
+* "yield" in singleton class syntax is warned and will be deprecated later.
+  [Feature #15575]
+
 === Core classes updates (outstanding ones only)
 
 Array::