Opaque structs

[Brad Anderson]

On Friday, 28 June 2013 at 01:40:44 UTC, Andrej Mitrovic wrote:
> Note that if we implement Issue 8728[1], we could even create a 
> better
> error message via:
>
> -----
> struct S
> {
>     @disable("S is an opaque C type and must only be used as a 
> pointer")
>     this();
>
>     @disable("S is an opaque C type and must only be used as a 
> pointer")
>     this(this);
> }
>
> void main()
> {
>     S* s1;  // ok
>     S s2;  // user error
> }
> -----
>
> [1] : http://d.puremagic.com/issues/show_bug.cgi?id=8728

+1.  Anything that makes error messages clearer is a win in my 
book and there is precedents for it in @deprecate(msg) which was 
a clear win.