Compile time only delegates

[Frustrated]

Due to a previous issue I am trying to do the following

mixin template A()
{
     mixin((function () => "int x;")() );
}

the problem is that the compiler will not let me use the delegate 
because it has no this context. Of course the whole point here is 
that the delegate will never be used at runtime since it is used 
in the mixin(which is purely compile time).

It should work(there is no reason it shouldn't) yet it doesn't.

The goal is that I do not want to create a function outside the 
mixin to use because it will be included in the context of the 
template mixin. e.g.,

mixin template A()
{
     string B() { return "int x;"; }
     mixin(B()); // still doesn't work but if it did B would be 
inserted in the context of the template. e.g., if used in a class 
the class would then have a method named B in it, hence the use 
of the lambda.
}