An array of traits?

traits.go

package main

import "fmt"

type Trait interface {
	String() string
}

type Traitable struct {
}

func (t Traitable) String() string {
	return "me!"
}

func main() {
	traitables := []Trait{
		Traitable{},
	}
	for _, t := range traitables {
		fmt.Println(t.String())
	}
}

This outputs:

me!