The following does not compile (with -version=broken):

class A(T)
{
     version(broken)
     {
         class B
         {
             T blah() { return t; }
         }
     }

     T t;
}

mixin A!(int);

int main()
{
     A!(int) a = new A!(int)();
     return 0;
}

and gives the errors:

Error: this for t needs to be type A not type test2.A!(int).A
Error: class test2.A!(int).A member t is not accessible
Error: template instance test2.A!(int) error instantiating

However, it does compile if B.blah() is changed to: return this.outer.t