If, however, you're trying to inject friend access to something outside def's module, then you might want to reconsider what you're trying to accomplish and whether it can be done differently.
Was just dreaming of how to transpile C++ code to D :(Curiously enough, friend injection was not made part of the standard back in 1998 and only g++ supported it through a non-standard extension. But now here we are. I wonder why this was allowed.
