[ruby-talk:11475] eval-context problem (bug?)

Hi all,
the following code (part of this is from "Programming Ruby"):
>>>>
content = '
class Module
  @@docs = Hash.new(nil)
  def doc(str)
    @@docs[self.name] = str
  end

  def Module::doc(aClass)
    aClass = aClass.name if aClass.type <= Module
    @@docs[aClass] || "No documentation for #{aClass}"
  end
end

class Example
  doc ("This is a sample documentation string") # 
  # .. rest of class
end

puts Module::doc(Example)
'

class Test
  def getBinding
    return binding
  end
end

#eval(content) # works as expected
eval(content, Test.new.getBinding()) # fails
<<<<<

Produces the following error:
D:\Projekte\rubychannel\ProgrammingRuby\html\test.rb:34:in `eval':
(eval):15:in `getBinding': undefined method `doc' for Test::Example:Class
(NameError) 
        from D:\Projekte\rubychannel\ProgrammingRuby\html\test.rb:34

This does not happen when eval-uating in the default-(i.e. main-)context.

Is this a bug or an executing context related feature?
Clemens