super.==(x)

I checked in this:

https://lampsvn.epfl.ch/trac/scala/changeset/22702

Figuring it could hardly be worse than runtime failure, as noted here:

http://lampsvn.epfl.ch/trac/scala/ticket/3736

But then it occurred to me that these methods can be overloaded. Even
isInstanceOf can be overloaded, fun. So if that is to be supported then
I better find some other way, else you can't call the overloaded
verisons in superclasses. At first I had tried rewriting those calls
like .## already is, but it wasn't as simple as ## because they're
binary methods and the analogous code exploded the compiler.

Personally I'd say only unhappiness is likely to come of overloading
these methods and it'd be better to disallow it, but I can understand
wanting to preserve the illusion that there's no special case.