Calling an alias for a Class method in another scope

[d coder]

Greetings

Kindly make me understand this. I have been trying to call an alias for a
class method from another scope. I keep getting an error saying that I need
"this" to call a method. Why will not "this" pointer be available when I am
passing the method symbol along with an object of the class? Is there
another way of doing what I am trying to achieve. I have pasted a sample
code below here.

Regards
- Puneet

void callfoo(alias F, T) (T t) {
  void foo() {
    F();   // Error: need 'this' to access member foo
    t.F(); // Error: undefined identifier 'F'
  }
}

class Foo {
  void foo() {}
}

void main() {
  Foo f = new Foo();
  callfoo!(f.foo)(f);
}
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