Making sense out of scope and function calls

[0xEAB via Digitalmars-d-learn]

```d
struct Foo { /* … */
    hstring[] getHeader(LowerCaseToken name) scope return
    {
        return _headers[name].values;
    }
    hstring[] getHeader(hstring name)() scope return
    {
        enum token = LowerCaseToken.makeConverted(name);
        return this.getHeader(token); // line 605
    }
}
```

```d
struct Foo { /* … */
    hstring[] getHeader(LowerCaseToken name) scope return
    {
        return _headers[name].values;
    }

    hstring[] getHeader(hstring name)() scope return
    {
        enum token = LowerCaseToken.makeConverted(name);
        return _headers[token].values; // line 605
    }
}
```

Why does only the latter sample compile?
The former leads to the following warning:

```
beyond.d(605,30): Deprecation: cannot take address of `scope` 
variable `this` since `scope` applies to first indirection only
beyond.d(605,30): Deprecation: cannot take address of `scope` 
variable `this` since `scope` applies to first indirection only
```

(and why is the deprecation message printed twice?)