[Issue 20820] New: [ob][DIP1021]Borrowing by a scope variable is not equivalent to a scope argument

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20820

          Issue ID: 20820
           Summary: [ob][DIP1021]Borrowing by a scope variable is not
                    equivalent to a scope argument
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: lempiji at gmail.com

Would it be appropriate for the following two to behave differently?
I think both should be NG for the same reasons.

https://run.dlang.io/is/X7Xf8l

```
import std;
import core.stdc.stdlib;

void main() @live {
    auto p = cast(byte*) malloc(10);
    scope(exit) free(p);

    scope ps = p[0 .. 10];
    writeln(ps); // NG
    //writelns(ps); // OK
}

void writelns(Args)(scope Args args...)
{
    writeln(args);
}
```

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