Fix 48631_neg test in _GLIBCXX_VERSION_NAMESPACE mode

[François Dumont]

On 27/09/21 11:06 pm, Jonathan Wakely wrote:
> On Mon, 27 Sept 2021 at 21:26, François Dumont via Libstdc++
> <libstdc++@gcc.gnu.org> wrote:
>> Here is a small patch to fix a test which fails in
>> _GLIBCXX_VERSION_NAMESPACE mode.
>>
>> IMHO it would be better to avoid putting <type_traits> content in
>> versioned namespace, no ?

No opinion on this, you prefer to use consistently the versioned namespace ?


>>
>> There is of course more work to do, so for now here is the simpler approach.
>>
>> Ok to commit ?
> Leaving the pattern ending with just "struct" isn't very useful.
> Wouldn't it be better to do:
>
> // { dg-prune-output "no type named 'type' in" }
>
> or just:
>
> // { dg-prune-output "enable_if" }
>
> ?
>
> Either of those is OK to commit.

Done with "enable_if"