Is there any good reason why C++ namespaces are "closed" in D?

[Nicholas Wilson]

On Monday, 30 July 2018 at 02:53:43 UTC, Nicholas Wilson wrote:
> On Monday, 30 July 2018 at 02:15:57 UTC, Walter Bright wrote:
>> On 7/29/2018 1:45 PM, Manu wrote:
>>> There's no way you'll get a bug report from someone 
>>> complaining they
>>> can't multiply define symbols in the same scope. That's 
>>> common sense.
>>
>> But then you cannot interface with this C++ code:
>>
>>     namespace ab { void foo(); }
>>     namespace cd { void foo(); }
>>
>> Why would you find this acceptable?
>
> But you can if ab and cd are in different modules. The point is 
> to decouple the mangling from the scope, leave the scope to D's 
> module system, leave the mangling to extern(C++, "foo")

Not that this alleviates Alita's issues at all.