thinking.rb

# file1

namespace Yehuda

class String
  def printout
    puts self
  end
end

# file1 after recompilation

class String
  literal[0] = CompiledMethod.new { puts self }
  Rubinius.add_method self, :"__ns__::Yehuda::printout", literal[0]
end

# file2

namespace Rails

class String
  def printout
    puts "Rails: #{self}"
  end
end

# file2 after recompilation

class String
  define_method("__ns__::Rails::printout") do
    puts "Rails: #{self}"
  end
end

# file3

use Yehuda
use Rails

"Yehuda".printout

# file2 after recompilation

tmp = "Yehuda"
if tmp.respond_to?("__ns__::Yehuda::printout")
  tmp.send("__ns__::Yehuda::printout")
elsif tmp.respond_to?("__ns__::Rails::printout")
  tmp.send("__ns__::Rails::printout")
else
  tmp.printout
end