For those that attended the meeting, here is my code where
I introduce a singleton class in a singleton class.

class C

class << self
class << self
def foo
"foo"
end
end

def fred
"fred"
end

def single
class << self
self
end
end
end
end

p C.fred
p C.single.foo

b = C.clone
p b.fred
p b.single.foo # undefined method foo



--
Jim Freeze