return scope ref outlives the scope of the argument

[Eugene Wissner via Digitalmars-d-learn]

struct Container
{
}

static struct Inserter
{
    private Container* container;
    private this(return scope ref Container container) @trusted
    {
        this.container = &container;
    }

}

auto func()()
{
    Container container;
    return Inserter(container);
}

void main()
{
    static assert(!is(typeof(func!())));
}

The code above compiles with dmd 2.085, but not 2.086 (with 
-preview=dip1000). What am I doing wrong?