Parameter is null by default. No value is given. Code says it is not null.

[Daniel Kozak via Digitalmars-d-learn]

On Thursday, 9 April 2015 at 14:42:33 UTC, Daniel Kozak wrote:
> On Thursday, 9 April 2015 at 14:30:07 UTC, Daniel Kozak wrote:
>> On Thursday, 9 April 2015 at 14:25:56 UTC, Daniel Kozak wrote:
>>> On Thursday, 9 April 2015 at 14:16:00 UTC, tcak wrote:
>>>> By the way, I am using "DMD64 D Compiler v2.067.0" on Ubuntu 
>>>> 14.04.
>>>
>>> I have Archlinux DMD64 D Compiler v2.067.0 and it works OK 
>>> for me.
>>
>> WOW
>>
>> rdmd app.d(without params):
> Ok rdmd and dub works because they are use ldc, but do not me 
> ask how. I always think that dub and rdmd should use dmd 
> compiler until I tell them otherwise

I try it with DMD64 D Compiler v2.066 and same problem occured. 
So probably some backend problem. You should create an issue on 
https://issues.dlang.org