So just to be clear, "ref" parameters can now take rvalues?
There's one minor problem I see with this:
S currentVar;
void makeCurrent(ref S var) {
currentVar = var;
}
makeCurrent(getRValue());
If "makeCurrent" knew that "var" was an rvalue it could avoid
calling "postblit" on currentVar, because it's simply a move
operation, thus saving a potentially costly deep copy operation
and extra destructor call.
