allMembers broke for __

[aliak]

On Sunday, 17 June 2018 at 22:55:57 UTC, Walter Bright wrote:
> On 6/15/2018 11:08 PM, DigitalDesigns wrote:
>> When an identifier starts with __, allMembers does not return 
>> it. This is very bad behavior! It can silently create huge 
>> problems if the programmer is not aware of the bug.
>
>
> It's not a bug, it's quite deliberate:
>
>   
> https://github.com/dlang/dmd/blob/master/src/dmd/traits.d#L1385
>
>
> Identifiers starting with __ are reserved for the 
> implementation:
>
>   https://dlang.org/spec/lex.html#identifiers
>
> They have implementation-defined behavior. Do not use them in 
> user code.

Holy cyclomatic complexity batman!

Is the extern(C++) on semanticTraits remnants from converting dmd 
to d?

Cheers
- Ali