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5.2.9 No_Implicit_Aliasing

[GNAT] This restriction, which is not required to be partition-wide consistent, requires an explicit aliased keyword for an object to which 'Access, 'Unchecked_Access, or 'Address is applied, and forbids entirely the use of the 'Unrestricted_Access attribute for objects. Note: the reason that Unrestricted_Access is forbidden is that it would require the prefix to be aliased, and in such cases, it can always be replaced by the standard attribute Unchecked_Access which is preferable.