struct Foo may not define both a rvalue constructor and a copy constructor

[drug via Digitalmars-d-learn]

struct Foo
{
    this(ref const(Foo) other) {}
    this(const(Foo) other) {}
}
I'm trying to update dmd version and starting from 2.086 my code doesn't 
compile due to the error above. What is the reason of that? Is it 
temporarily situation?