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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: discriminants and derived types Q
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Date: 2003-06-19T22:05:22+00:00
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I have two compilers that accept this package spec, and one that complains
about child3, though it accepts child1 and child2.  Who's right and why?

package testsd is

  type parent1(a,b:integer) is record null;end record;
  type child1(b:integer) is new parent1(a=>1,b=>b);

  type parent2(a,b:integer) is tagged null record;
  type child2(b:integer) is new parent2(a=>1,b=>b) with null record;

  type parent3(a,b:integer) is tagged null record;
  type child3(b:integer) is new parent3(a=>1,b=>b) with private;
                           --   ^  error point

private
  type child3(b:integer) is new parent3(a=>1,b=>b) with null record;

end testsd;

testsd.ads:10:33:  Only static constraints allowed for parent
discriminants in the partial view