Immutability and arrays

[Steven Schveighoffer]

On 12/14/21 11:19 AM, Steven Schveighoffer wrote:

> Er... scratch that, this isn't construction, it should use opAssign. 
> Again, probably because memcpy+postblit is used by the runtime.
> 
> If not reported, it should be.

Simple proof that it is a bug:

```d
immutable (ComplexStruct)[] arr;
ComplexStruct[] arr2;

arr2[0] = arr[0]; // ok
arr2[] = arr[]; // error
```

If you can copy one element, you should be able to copy all the elements.

-Steve