T opImplCast(T)() so we can add @disable to it?

[Manu]

On 23 May 2018 at 17:30, Sjoerd Nijboer via Digitalmars-d
<digitalmars-d at puremagic.com> wrote:
> While tinkering with some code I eventually found that the following didn't
> do as I expected
>
> import std.conv;
> import std.stdio;
>
> void main()
> {
>     Foo foo = 5;
>     writeln(foo);
> }
>
> struct Foo{
>     int i;
>     alias i this;
>     @disable T opCast(T)();
>     this(int j)
>     {i =j;}
> }
>
> If the cast in the example is implict this code compiles and executes.
> If the cast is explicit it doesn't.
> Is there a plan to expose something like 'opImplCast()()' so I can @disable
> it for some types where I absolutely don't want any accidental type
> conversions?
> Shouldn't this just be a feature of D?

I would REALLY love a way to implement an implicit cast that wasn't
`alias this` based... for reasons that are NOT to @disable it :P