How to assign a delegate to a var ?

[bioinfornatics via Digitalmars-d-learn]

Hi,

I would like store the delegate to another var but when i try i
get:


testTraitsWithDelegate.d(13): Error: expression template
__lambda2 is void and has no value

I do not want to run it only to save the «function» somewhere.


----------- CODE ------------
import std.stdio;
import std.typecons : Tuple;

struct attribute( alias Pred )
{
     alias Predicate = Pred;
}



struct Data
{
     @attribute!( (a) => a == 42 )
     int x;
}



void main()
{

     bool delegate( int ) tmp;

     pragma( msg, __traits(getAttributes, Data.x)[0].Predicate( 42
) );

     tmp = __traits(getAttributes, Data.x)[0].Predicate;
}
----------- END CODE ------------