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From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: Re: 'for cursor in container.first loop' bug?
References: <85y4u8xztj.fsf@stephe-leake.org> <lto1h3$cja$1@loke.gir.dk>
Date: Fri, 29 Aug 2014 08:52:12 -0500
Message-ID: <85lhq7xv1v.fsf@stephe-leake.org>
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Date: 2014-08-29T08:52:12-05:00
List-Id: <comp.lang.ada>

"Randy Brukardt" <randy@rrsoftware.com> writes:

> "Stephen Leake" <stephen_leake@stephe-leake.org> wrote in message 
> news:85y4u8xztj.fsf@stephe-leake.org...
>>
>>   Loop_2 :
>>   for Cursor in First (A) loop
>>      Put_Line ("A (I) => " & Integer'Image (Element (Cursor)));
>>      Replace_Element (A, Cursor, 2);
>>      Reference (A, Cursor) := 2;
>>   end loop Loop_2;
>>
>> gnatmake -k ../try_containers.adb
>> gcc -c -I../ -I- ../try_containers.adb
>> try_containers.adb:17:28: invalid prefix in call
>> try_containers.adb:17:28: invalid prefix in selected component "I572b"
>>
>> Am I missing something simple, or is this a compiler bug? At the very
>> least, it's not a good error message.
>
> You're missing something simple: "First" is not an iterator (it returns a 
> cursor). You need to use one of the functions named "Iterate" that return a 
> value that has an iterator type:
>
> Loop_2 :
> for Cursor in Iterate (A) loop

Ah, thanks. That fixed it.

> I'd still call it a bug, though, because the error message is inpenatrable 
> for something simple (a violation of 5.5.2(3/3)). Indeed, this shouldn't 
> even resolve.

I'll report it.

-- 
-- Stephe