func (r *realFS) RemoveAll(name string) error {
	return os.RemoveAll(name)
}
RemoveAll is the interface implementation for FS.
package sys
import (
	"fmt"
	"io/ioutil"
	"os"
)
type FS interface {
	ReadFile(filename string) ([]byte, error)
	RemoveAll(name string) error
}
func RealFS() FS {
	return &realFS{}
}
type realFS struct{}
func (r *realFS) ReadFile(name string) ([]byte, error) {
	return ioutil.ReadFile(name)
}