Re: scope front vs [0]

[vitamin via Digitalmars-d-learn]

Or similar problem:

class Foo{}
struct Slice{
    Foo[] data;

    this(return scope Foo[] data)@safe {
        this.data = data;
    }
    Slice opSlice()@safe return scope{
        return Slice(data);
    }
    Foo opIndex(size_t i)@safe return scope{
        return data[i];
    }
}

void main()@safe{
    Foo foo;
    scope Slice slice = Slice([new Foo]);

    foo = slice[][0];           //OK, Why?
    foo = slice[].opIndex(0);	//Error: scope variable slice 
assigned to foo with longer lifetime
}