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Newsgroups: comp.lang.ada
From: porton@ex-code.com (Victor Porton)
Date: Tue, 21 Jan 2003 07:06:00 +0500
Organization: Extreme Code Software (http://ex-code.com)
Subject: Bug: compiler hangs on circular type dependency
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This is sent to report@gnat.com and duplicated in comp.lang.ada

Gnat (both 3.14 and 3.15) hangs on compiling the following
(erraneous) stuff:

package P is
    type A is tagged null record;
    type B is new A with private;
    type C is new A with private;
private
    type B is new C with null record;
    type C is new B with null record;
end P;

BTW, comp.lang.ada, what in Ada Standard deprecated such circularity?
Isn't it forgotten in the Standard itself?