New problem compiling g-exctra.adb

[Richard Kenner]

    Nope.  That's the whole point.  Our implementation will only create a
    name tag (ie, a "good" tag) for pointers that have PT_VARS or
    PT_MALLOC.  If you ignore it, it won't get a name tag, it will use a
    type tag, which will make it alias to everything in sight.

Why will it get a tag *at all*?

If I have:

	char *p;
	char *q = 0;

and then the only assignments to both P and Q are from &a and &b, they both
should be treated the same: as variables that can only alias A and B.  The
fact that one also has an assignment of zero shouldn't matter at all.