How to copy const object?

[Mitacha via Digitalmars-d-learn]

I've a const struct object and I'd like to make a mutable copy of 
it.
Struct definition contains string and an array of structs.
```
struct A {
    string a;
    B[] b;
}
struct B {
    string a;
    string b;
}
```
As far as I can tell copy constructor isn't generated for struct 
`A` because it contains an array. Correct?

Is there an idiomatic way to create copy of a const object?