o!(const(T)) parameter.

[sclytrack via Digitalmars-d-learn]

>
> It works when you exclude the recursive alias this:
>     static if(!is(T == const)) alias constify this;
>
> Your original program crashes the compiler, which is always a 
> bug. I filed an issue:
> https://issues.dlang.org/show_bug.cgi?id=14499

Thank you, very much.