envy.go
func MustSet(key string, value string) error {
	gil.Lock()
	defer gil.Unlock()
	err := os.Setenv(key, value)
	if err != nil {
		return err
	}
	env[key] = value
	return nil
}
func MustSet(key string, value string) error {
	gil.Lock()
	defer gil.Unlock()
	err := os.Setenv(key, value)
	if err != nil {
		return err
	}
	env[key] = value
	return nil
}
func MustSet ( key string , value string ) error { gil . Lock ( ) defer gil . Unlock ( ) err := os . Setenv ( key , value ) if err != nil { return err } env [ key ] = value return nil }
// MustSet the value into the underlying ENV, as well as envy.
// This may return an error if there is a problem setting the
// underlying ENV value.
MustSet the value into the underlying ENV as well as envy . This may return an error if there is a problem setting the underlying ENV value .