$ dmd testStructEnum.d
testStructEnum.d(6): no property 'Id' for type 'Value'
testStructEnum.d(6): Value.Id is used as a type
testStructEnum.d(6): cannot have parameter of type void

$ dmd testStructEnum.d -version=works
gcc testStructEnum.o -o testStructEnum -m32 -lphobos -lpthread -lm -Xlinker -L/home/bsmith/tools/d/dmd/lib
$ ./testStructEnum
1



----- testStructEnum.d -----
import std.stdio;

version(works) {
} else { // Doesn't work

  void f(Value.Id t) {
    writefln(cast(int)t);
  }

}

struct Value {
  public static enum Id {
    A,
    B
  }
}

version(works) {

  void f(Value.Id t) {
    writefln(cast(int)t);
  }

}

void main() {
  Value.Id t = Value.Id.B;
  f(t);
}
----------