non-constant expression

[Frits van Bommel]

Jarrett Billingsley wrote:
> It looks weird, declaring a as a const and then assigning it in the static 
> this(), but that's perfectly legal -- you can assign to constant values 
> once, but that assignment can happen anywhere. 

I'm pretty sure you can only assign it in the appropriate constructor:
static member --> static this() as member of same class/struct/whatever
non-static member --> this() [other parameter lists also allowed]
module-scope --> static this() at module scope