[Issue 22519] New: [dip1000] cannot take address of `ref return`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22519

          Issue ID: 22519
           Summary: [dip1000] cannot take address of `ref return`
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dkorpel at live.nl

Compile with -preview=dip1000
```
@safe:
void main() 
{
    int x;
    int* a = &identity(x); // error
    int* b = identity(x).addressOf; // workaround
}

ref int identity(return ref int x) {return x;}
int* addressOf(return ref int x) {return &x;}
```

> onlineapp.d(5): Error: cannot take address of `ref return` of `identity()` 
> in `@safe` function `main`

This is a needless limitation. As shown, it can be worked around using the
`addressOf` function instead of the & operator.

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