func main() {
	type MyConfig struct {
		Slice []struct {
			A int
		} `json:"slice" toml:"slice"`
	}

	var cfg MyConfig
	loader := aconfig.LoaderFor(&cfg, aconfig.Config{
		// feel free to skip some steps :)
		// SkipDefaults: true,
		// SkipFiles:    true,
		// SkipEnv:      true,
		// SkipFlags:    true,
		EnvPrefix:  "APP",
		FlagPrefix: "app",
		Files:      []string{"config.toml"},
		FileDecoders: map[string]aconfig.FileDecoder{
			// from `aconfigyaml` submodule
			// see submodules in repo for more formats
			".toml": aconfigtoml.New(),
		},
	})

	if err := loader.Load(); err != nil {
		panic(err)
	}
	fmt.Printf("%+v\n", cfg)
}