Is there a way to turn the warning in subj. into an error?

I'm trying to use const_missing to dynamically look up stuff when it
is referenced, but now I'm in trouble because e.g. System::GC does not
invoke Module#const_missing because GC is already defined at the
toplevel.

Any ideas? Isn't ruby behaving strangely here? It seems to me that
Module#const_missing is mostly useless if it doesn't work with all the
names that happen to be defined in the global scope.

Cheers,

Thomas

####### Example:

module M1
  def self.const_missing(aSymbol)
    puts "Looking for #{aSymbol}"
   end
end

M1::Object
(irb):16: warning: toplevel constant Object referenced by M1::Object
=> Object

M1::SomethingElse
Looking for SomethingElse
=> nil