binding_test.rb

def root_binding
  binding
end


module Blah
  def self.root_binding
    @root_binding
  end

  def self.root_binding=(b)
    @root_binding = b
  end
end

Blah.root_binding = lambda { binding }

a = 1

eval('puts a', root_binding)

eval('puts a', Blah.root_binding)