if err != nil {
		// Should not happen - b.CFlags was given an empty package.
		fmt.Fprintf(os.Stderr, "go: invalid cflags: %v\n", err)
		return nil
	}
	cmd := b.GccCmd(".", "")

	join := func(s []string) string {
		q, err := quoted.Join(s)
		if err != nil {
			return strings.Join(s, " ")
		}
		return q
	}

	ret := []cfg.EnvVar{

				return
			}

			for c, args := range rt.testCases {

				cCmd := getCmd(rt.cmd, c)
				if cCmd == nil {
					t.Errorf("cmd didn't have %s subcommand\n", c)
					continue
				}

				// Test passing argument set
				err := cCmd.Args(cCmd, args.pass)
				if err != nil {
					t.Errorf("command %s should validate the args: %v\n %v", cCmd.Name(), args.pass, err)
				}

				// Test failing argument set