[Issue 24842] No ability to overload unary logial not operator

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24842

--- Comment #5 from Mai Lapyst <info at lapyst.by> ---
Thats hardly an reason imho. Because if we use that logic, everybody would
expect `+`  to only work on numerical values since it means "addition", jet
it's perfectly fine to do things like this:

```d
struct A {}
struct B {}
struct C {
   B opBinary(string op : "+")(A rhs){
     return B();
   }
}

void main() {
  C c;
  B b = c + A();
}
```

I would argue that this produces the same "shooting yourself in the foot" as an
overloadable ! operator would.

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