# File lib/rspec/mocks/mutate_const.rb, line 245
        def mutate
          @context = recursive_const_get(@context_parts.join('::'))
          @original_value = get_const_defined_on(@context, @const_name)

          constants_to_transfer = verify_constants_to_transfer!

          @context.send(:remove_const, @const_name)
          @context.const_set(@const_name, @mutated_value)

          transfer_nested_constants(constants_to_transfer)
        end