Disabling opAssign in a type disabled all the opAssigns of an aliased type?

[Alex]

On Monday, 30 July 2018 at 18:30:16 UTC, aliak wrote:
> Is this a bug?
>
> If not is there a workaround?
>
> I would like for the alias this to function as a normal A type 
> unless B specifically disables certain features, but it seems 
> weird that disabling one opAssign disables all of them inside 
> the aliases type but not in the aliasing type?
>
>
> struct A {
>     void opAssign(int) {}
> }
> struct B {
>     A a;
>     alias a this;
>     @disable void opAssign(float);
> }
>
> void main() {
>     B b;
>     b = 3;
> }
>
> Error: function `onlineapp.B.opAssign` is not callable because 
> it is annotated with @disable
>
> Cheers,
> - Ali

What happens if you omit the @disable line?