What does 'scope' mean for non-class types?

[Don]

div0 wrote:
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> Lars T. Kyllingstad wrote:
>> In D2, what is the effect (if any) of 'scope' in the following situations?
>>
>>   scope int a;
> 
> Nothing
> 
>>   struct B { ... }
>>   scope B b;
> 
> Nothing, B's destructor will be called even without scope.
> 
>>   scope int[] c;
> 
> c gets deleted when the scope ends. this applies to classes as well.
> 
>>   // According to the spec, 'in' is shorthand for 'const scope'.
>>   void foo(in char[] d) { ... }
> 
> d is const (read only).
> I've no idea why scope is mentioned, it's meaningless in the context
> of function arguments.

I think in one of the early, complicated versions of the const system, 
it meant something. Looks like this mention of it was accidentally left 
in the spec.