---
bool f()
{
    int[3] a=1;
    assert(a[0]==1);
    g(a[0..2]);
    assert(a[0]!=1); //fails
    assert(a[0]==2);
    return true;
}
void g(ref int[2] a)
{
    int[2] b=2;
    a=b;
    assert(a[0]==2);
}
static assert(f());
---
The feature was apparently introduced in 2.063 and worked until 2.066.
Works with explicit array operation a[]=b[];