Variadic parameter of length 1

[monarch_dodra via Digitalmars-d-learn]

On Wednesday, 20 August 2014 at 15:11:53 UTC, Dominikus Dittes 
Scherkl wrote:
> I have several times seen a construct
>
> template foo(T...) if(T.length == 1)
> {
>     ...
> }
>
> What is that good for?
> Why using variadic parameter if anyway exactly one parameter is
> required?!?

AFAIK, it's a historical workaround to accept T as either alias 
or not alias, as varargs have "auto alias". EG:

foo!int //OK
foo!"hello" //OK too