static code generation p2

[js.mdnq]

Take the example here:

http://forum.dlang.org/thread/vrupqijwqmccdpabmken@forum.dlang.org

note how he provides the body of the method in the mixin. I would 
like to something similar to what he has done but provide the 
body of the mixin after the fact(so to speak).

Something like

class Test {
   mixin make_method!(Test)
   {
       writeln("I am a banana");
   }
}

or even

class Test {
   mixin make_method!(Test)
   ({
       writeln("I am a banana");
   });
}


(I may want to parse the body too, but at this point it's not 
relevant)

I also want to be able to do a similar thing with structs and 
classes:

mixin make_struct!(Test)
({
     public:
      int v;
});

which would produce the obvious

struct Test { public: int v; }