[Issue 23669] New: [DIP1000] Compound assignment to length of slice member variable in scope method fails

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23669

          Issue ID: 23669
           Summary: [DIP1000] Compound assignment to length of slice
                    member variable in scope method fails
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: snarwin+bugzilla at gmail.com

As of DMD 2.102.0, the following program fails to compile:

---
struct S
{
    string[] a;
    @safe void reserve() scope
    {
        a.length += 1; // error
    }
}
---

The error message is

---
bug.d(6): Error: cannot take address of `scope` variable `this` since `scope`
applies to first indirection only
---

This error is both wrong and spurious: the address of `this` is not taken, and
the program should compile successfully.

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