Multiple alias this is coming.

["Nordlöw" via Digitalmars-d-announce]

On Thursday, 18 September 2014 at 22:13:14 UTC, IgorStepanov 
wrote:
> Is Nullable!(T) with polymorphic type disallowed now?

Sorry, I meant

     NotNull(T)

Here's a module

https://github.com/nordlow/justd/blob/master/notnull.d

a bit tweak from the original design by Adam D Ruppe.