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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Interresting,
 possibly buggy behavior in GNAT generics w/ expression function.
Date: Fri, 29 Mar 2013 15:48:21 +0000
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Date: 2013-03-29T15:48:21+00:00
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Shark8 <onewingedshark@gmail.com> writes:

> On Friday, March 29, 2013 8:47:36 AM UTC-6, Simon Wright wrote:
>> Shark8 <onewingedshark@gmail.com> writes:
>>
>>
>>
>> >     Function Image(Value : Positive) Return String is
>>
>> >       ( --if Value not in positive then "" else
>>
>> >         Units.Constant_Reference( Attribute_Units, Value ) );
>>
>>
>>
>> Or, of course, Attribute_Units (Value) !
>
> That doesn't work.
> That I'm pretty sure is a bug; in any case at least the [compile-time]
> error it gives is utterly useless:
> generic_attribute_set.ads:36:07: "" is undefined

With GCC 4.7.0, it gives a bug box.
With GNAT GPL 2012, as you say.
With GCC 4.8.0 (release candidate r196827) it works fine.