stub_source_index

# File lib/bundler/rubygems_integration.rb, line 416
    def stub_source_index(specs)
      Gem::SourceIndex.send(:alias_method, :old_initialize, :initialize)
      redefine_method(Gem::SourceIndex, :initialize) do |*args|
        @gems = {}
        # You're looking at this thinking: Oh! This is how I make those
        # rubygems deprecations go away!
        #
        # You'd be correct BUT using of this method in production code
        # must be approved by the rubygems team itself!
        #
        # This is your warning. If you use this and don't have approval
        # we can't protect you.
        #
        Deprecate.skip_during do
          self.spec_dirs = *args
          add_specs(*specs)
        end
      end
    end