Constructor qualifiers; bug or expected behavior?

[Seb]

On Monday, 2 April 2018 at 11:41:55 UTC, Eduard Staniloiu wrote:
> On Monday, 2 April 2018 at 10:26:32 UTC, RazvanN wrote:
>> [...]
>
> The compiler does an implicit conversion from the type 
> `immutable B`
> to the type `B`. It is able to do safely do so because `struct 
> B` has only
> value types that can be copied.
>
> The same thing happens for
>     immutable x = 1;
>     int y = x;
>
> If you add an indirection in `struct B`, as such
>
> struct B
> {
>     int a;
>     int* p;
>     /* ... */
> }
>
> Then you can see that the implicit conversion fails with
> "onlineapp.d(22): Error: cannot implicitly convert expression 
> B(0, null).this(2) of type immutable(B) to B"
>
> I put the code at
> https://run.dlang.io/gist/83756973012fcb4fec2660a39ffdad90&args=-unittest?args=-unittest
>
> The same conversion rules that apply to built in qualified 
> types applies to structs. I'm guessing the same is for classes 
> but I haven't played that much with those so a second opinion 
> would be nice :)
>
> Cheers,
> Edi

FYI sth. seems to have gone wrong with the current migration to 
authenticated Gists.
Sorry about the inconvenience, the hotfix is already in the 
deploy queue and for this - the exported URL should have been:

https://run.dlang.io/gist/83756973012fcb4fec2660a39ffdad90?args=-unittest