Binary(b, c, builder.opts().WithName("D"));

  GraphDef graphdef_in;
  FunctionDefLibrary library_in;
  TF_EXPECT_OK(builder.ToGraphDef(&graphdef_in));
  *library_in.add_function() = test::function::XTimesTwo();

  GraphDef graphdef_out = graphdef_in;
  FunctionDefLibrary library_out = library_in;
  TF_EXPECT_OK(Encapsulate(&graphdef_out, &library_out));