Disable some concept checks in C++11

[François Dumont]

On 10/03/2017 13:25, Jonathan Wakely wrote:
> On 08/03/17 22:03 +0100, François Dumont wrote:
>>    So slist also require it for its assign implementation. And a 
>> slist of not assignable type instances is used in 
>> libstdc++-prettyprinters/59161.cc.
>
> That test is ill-formed, strictly speaking. It violates the concept
> requirements of the slist type. It works because it never tries to
> assign them.
>
> If you're concerned you could forcibly disable the concept checks in
> that testcase. But I'd just stop  using the concetp checks :-)
>
>
>> Should I just forget about it ?
>
> Yes. They're broken. I don't think it's a good use of your time.
>
>> Go ahead with the patch except the slist part and then disable 
>> concept checks ?
>
> If by "disable concept checks" you mean stop building with them
> enabled, then yes, I think you should do that :-)

Yes, this is what I meant so I'll do that.

>
> The rest of the patch is OK, but please wait for Stage 1. Be sure to
> test without concept checks enabled too.
>
Ok I add it to my list of awaiting commits.

François