[Issue 23208] New: [dip1000] missing return scope inference after parameter assignment

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23208

          Issue ID: 23208
           Summary: [dip1000] missing return scope inference after
                    parameter assignment
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dkorpel at live.nl

This should fail with `-preview=dip1000`:
```
int* rsfail()(scope int* p, int* r) @safe
{
    r = p;
    return r; // should infer return scope on p
}

int* escape() @safe
{
    int i;
    return rsfail(&i, null); // passes
}
```

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