WIP

Author: eernstg

working/augmentation-libraries/feature-specification.md

@@ -871,6 +871,9 @@ It's a **compile-time error** if:
     constructor is not, or vice versa. *An augmentation can't change whether or
     not a constructor is generative because that affects whether users are
     allowed to call the constructor in a subclass's initializer list.*
+    
+*   More than one constructor declaration in an augmentation chain specifies
+    a default value for the same parameter.
 
 An incomplete constructor can be completed by adding an initializer list and/or
 a body, or by adding a redirection: