Storage_Error with parameterized records

[Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>]

May be I have something severely missunderstood, but I have no idea,
why the declaration

   subtype Correlation_Coefficient is Float;

   type CMatrix is
      array (Natural range <>, Natural range <>) of
        Correlation_Coefficient;

   type Correlation_Matrix(Last_Line : Natural := 0) is
      record
	 Mat : CMatrix(0 .. Last_Line, 0 .. Last_Line);
      end record;

causes the following warnings (and at runtime the promised
Storage_Error):

  warning: Storage_Error will be raised at run-time
  warning: creation of object of this type may raise Storage_Error

I had hoped this code was sufficiently close to John Barnes
Square example in chapter 16 of Programming in Ada 95 and I also
didn't find a restriction in the RM that explained this warning.

And idea?

Markus

-- 
Markus G. Kuhn, Security Group, Computer Lab, Cambridge University, UK
email: mkuhn at acm.org,  home page: <http://www.cl.cam.ac.uk/~mgk25/>