generic function instance without call

[vit via Digitalmars-d-learn]

Hi, is it possible to get address of generic function instance 
for specified arguments without calling the function?

Example:

```d

auto foo(alias fn, Args...)(auto ref Args args){
    ///return function/delegate type of `fn` for arguments `args`
}

void main(){

    long x;

    auto fn = foo!((a, b) => true)(new int(42), x);

    static assert(is(typeof(fn) == bool function(int*, scope ref 
long)@safe pure nothrow @nogc ));
}

```