    # File lib/spec/mocks/message_expectation.rb, line 30
          def build_child(expected_from, method_block, expected_received_count, opts={})
            child = clone
            child.expected_from = expected_from
            child.method_block = method_block
            child.expected_received_count = expected_received_count
            new_gen = error_generator.clone
            new_gen.opts = opts
            child.error_generator = new_gen
            child.clone_args_to_yield @args_to_yield
            child
          end