The following package spec

package B is
   type I is Interface;
   type C is new I with null record;
   function M return C;
   X : I'Class := I'Class (M);
end B;

triggers an infinite recursion in GNAT:

+===========================GNAT BUG DETECTED==============================+
| 4.4.0 20080409 (experimental) (i686-pc-linux-gnu) Storage_Error stack
overflow (or erroneous memory access)|
| Error detected at b.ads:5:20                                             |


-- 
           Summary: ICE: converting a concrete type into a classwide
                    interface
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sam at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35888

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