[Issue 12996] New: SList: linearRemove can't remove unmodified list's slice

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12996

          Issue ID: 12996
           Summary: SList: linearRemove can't remove unmodified list's
                    slice
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Phobos
          Assignee: nobody at puremagic.com
          Reporter: sigod.mail at gmail.com

This works:
```
auto s = SList!int(1, 2, 3, 4, 5);
auto r = s[];
popFrontN(r, 1);
auto r1 = s.linearRemove(r); // works
```
and
```
auto s = SList!int(1, 2, 3, 4, 5);
auto r = s[];
auto r1 = s.linearRemove(r.take(5)); // works
```

And this not:
```
auto s = SList!int(1, 2, 3, 4, 5);
auto r = s[];
auto r1 = s.linearRemove(r); // exception
```

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