[Issue 23987] Copy construction should not disable implicit conversion

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23987

--- Comment #3 from RazvanN <razvan.nitu1305 at gmail.com> ---
(In reply to RazvanN from comment #2)
> 
> void main()
> {
>     immutable(S) s1 = S(2);
>     immutable(S) s2 = s1;
>     writeln(*s2.p);
>     *s = 9;
>     writeln(*s2.p);
> }

`p` is not a pointer so no need for the `*`. Sorry for the bogus test case.
Correct code:

```
int* s;

struct S
{
    int p;

    this(const ref S src)
    {
        s = &p;
    }
}

void main()
{
    immutable(S) s1 = S(2);
    immutable(S) s2 = s1;
    writeln(s2.p);
    *s = 9;
    writeln(s2.p);
}
```

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