You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: util.go
    path of file: ./repos/moby/vendor/github.com/in-toto/in-toto-golang/in_toto
    
    the code of the file until where you have to start completion: package in_toto

import (
	"fmt"
)

/*
Set represents a data structure for set operations. See `NewSet` for how to
create a Set, and available Set receivers for useful se
    
func (s Set) IsSubSet(subset Set) bool {
	if len(subset) > len(s) {
		return false
	}
	for key := range subset {
		if s.Has(key) {
			continue
		} else {
			return false
		}
	}
	return true
}