[Issue 23981] New: enum siblings and struct member naming conflict undetected and counter intuitive path prefered

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23981

          Issue ID: 23981
           Summary: enum siblings and struct member naming conflict
                    undetected and counter intuitive path prefered
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dlang.org
          Assignee: nobody at puremagic.com
          Reporter: crazymonkyyy at gmail.com

```d
import std;
struct button_{
        int j;
        bool opCast(T:bool)(){
                "casted".writeln;
                return up;//down;
        }
        bool down(){
                assert(j==0,"called down on something not shift "~j.to!string);
                return true;
        }
        bool up(){
                assert(0,"I thought I was calling down");
        }
}
enum button{
        shift=button_(0),down=button_(1)
}
unittest{
        if(button.shift.down){
                "shift was pressed".writeln;
        }
}
enum abc{a,b,c}
unittest{
        abc foo;
        foo=foo.a.b.c.c.b.a;//?????????
}
```

I expect the enum button to contain a reference of shift that I can then ask if
its down

Instead, the shift has a sibling called down and that is the interpretation the
compiler prefers; this needs a warning or an error

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