From: "Jeffrey R.Carter" <spam.jrcarter.not@spam.acm.org.not>
Subject: Re: GNAT or Language Problems?
Date: Sat, 17 Jun 2023 11:21:18 +0200 [thread overview]
Message-ID: <u6jtue$16d9e$1@dont-email.me> (raw)
In-Reply-To: <u6jnbi$15r2k$1@dont-email.me>
On 2023-06-17 09:28, Randy Brukardt wrote:
> Regarding your second problem, refer to AI22-0041-1.
>
> Essentially, there are problems if predicates are involved. We changed the
> rule to require static compatibility (as a Binding Interpretation). I don't
> have the energy to look up what "static compatibility" requires in this case
> (enjoy figuring out 4.9.1). In some cases, it requires static matching, in
> others, it has weaker requirements.
There are no predicates involved. One can cut it down to just the type and constant:
package B_Strings_Prob is
type B_String (Max_Length : Positive := 1_000) is tagged limited private;
Null_B_String : constant B_String; -- A string of zero characters
private -- B_Strings_Prob
type B_String (Max_Length : Positive := 1_000) is tagged limited record
Len : Natural := 0;
Value : String (1 .. Max_Length) := (1 .. Max_Length => ' ');
end record;
Null_B_String : constant B_String := (Max_Length => 1, others => <>);
end B_Strings_Prob;
and still get the error:
$ gnatmake -gnatc b_strings_prob.ads
x86_64-linux-gnu-gcc-13 -c -gnatc b_strings_prob.ads
b_strings_prob.ads:12:04: error: subtype does not statically match deferred
declaration at line 5
gnatmake: "b_strings_prob.ads" compilation error
I don't see any mention of AI22-0041-1 in ARM 7.4.
> I don't have the time or energy tonight to look into your other problem.
> (I'm waiting for a backup to finish, or I would have already gone home --
> since I only got back from Lisbon last night, I'm not equipped for my usual
> late night work...)
I'm surprised you're this functional already.
--
Jeff Carter
"I was in love with a beautiful blonde once, dear.
She drove me to drink. That's the one thing I'm
indebted to her for."
Never Give a Sucker an Even Break
109
next prev parent reply other threads:[~2023-06-17 9:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-30 16:36 GNAT or Language Problems? Jeffrey R.Carter
2023-06-17 7:28 ` Randy Brukardt
2023-06-17 9:21 ` Jeffrey R.Carter [this message]
2023-06-17 17:50 ` Bill Findlay
2023-06-17 20:49 ` Jeffrey R.Carter
2023-06-22 9:51 ` Randy Brukardt
2023-06-22 12:56 ` Jeffrey R.Carter
2023-06-23 9:55 ` Randy Brukardt
2023-06-24 12:23 ` Jeffrey R.Carter
2023-06-26 21:42 ` Randy Brukardt
2023-06-27 10:16 ` Jeffrey R.Carter
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