str, _ := yaml.Render("test/main.yaml")
fmt.Println(str)

includes:
  #include /home/lwch/src/yaml/test/include.d/*.yaml
  #+++++ /home/lwch/src/yaml/test/include.d/include.yaml +++++
  next:
    #include /home/lwch/src/yaml/test/next.yaml
    #+++++ /home/lwch/src/yaml/test/next.yaml +++++
    title: next
    #----- /home/lwch/src/yaml/test/next.yaml -----
  #----- /home/lwch/src/yaml/test/include.d/include.yaml -----

var ret struct {
    Includes struct {
        Next struct {
            Title string `yaml:"title"`
        } `yaml:"next"`
    } `yaml:"includes"`
}
_ := yaml.Decode("test/main.yaml", &ret)
fmt.Println(ret)