[Bug ada/120430] Bogus "formal object is not referenced" when a generic parameter is used in a child package

[liam at liampwll dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120430

--- Comment #1 from Liam Powell <liam at liampwll dot com> ---
When a generic parameter of a package is used in a child package but not the
parent package a bogus warning is generated. Example below:

generic
   Foo : Integer;
package A is
end A;

generic
package A.B is
   function F return Integer is (Foo);
end A.B;

a.ads:2:04: warning: formal object "Foo" is not referenced [-gnatwu]