Why can't I give a function's return type the scope storage class?

[Walter Bright]

On 3/18/2019 10:22 AM, Meta wrote:
> struct Test
> {
>      int n = 3;
> 
>      @safe
>      int* test() return
>      {
>          return &n;
>      }
> 
>      @safe
>      scope int* test() return
>      {
>          return &n;
>      }
> 
>      @safe
>      scope int* test() return scope
>      {
>          return &n;
>      }
> }
> 

An explicit scope doesn't apply to the returned value, it attaches to the 
implicit `this` argument.