std::unique_ptr<WritableFile> new_file;
  Status status = env_->NewWritableFile(filepath, &new_file);
  if (!status.ok())
    GTEST_SKIP() << "NewWritableFile() not supported: " << status;

  const std::string test_data("asdf");
  status = new_file->Append(test_data);
  if (!status.ok()) GTEST_SKIP() << "Append() not supported: " << status;
  status = new_file->Flush();
  if (!status.ok()) GTEST_SKIP() << "Flush() not supported: " << status;

		ptr:      new(map[Point]string),
		err:      &UnmarshalTypeError{Value: "object", Type: reflect.TypeFor[map[Point]string](), Offset: 1},
	},
	{
		CaseName: Name(""),
		in:       `{"asdf": "hello world"}`,
		ptr:      new(map[unmarshaler]string),
		err:      &UnmarshalTypeError{Value: "object", Type: reflect.TypeFor[map[unmarshaler]string](), Offset: 1},
	},

	// related to issue 13783.