Where does "U" in Rebindable.Rebindable come from?

[Timon Gehr]

On 03/30/2012 09:20 PM, Philippe Sigaud wrote:
> On Fri, Mar 30, 2012 at 01:09, Simen Kjærås<simen.kjaras at gmail.com>  wrote:
>> The same pattern is used in std.typecons.isTuple:
>>
>> template isTuple(T)
>> {
>>     static if (is(Unqual!T Unused : Tuple!Specs, Specs...))
>>     {
>
> Wait, does that work now?

Yes.

> They added 'is(XXX, YYY...)'?

The syntax is static if(is(XXX Unused, YYY...)). (Where Unused is 
something you never have any use for.)